Unify metric names (#1209)

* unify metric names

* refactor standalone metrics

* headers sync metrics

* post-merge fix

* fix compilation

* fmt

* fix dashboards

* fix local dashboards

* update Rococo/Wococo runtime version

* remove commented code

* fixed grumbles

* fmt

* fixed widget names

bridges/primitives/chain-rococo/src/lib.rs

@@ -44,7 +44,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: sp_version::create_runtime_str!("rococo"),
 	impl_name: sp_version::create_runtime_str!("parity-rococo-v1.6"),
 	authoring_version: 0,
-	spec_version: 9004,
+	spec_version: 9100,
 	impl_version: 0,
 	apis: sp_version::create_apis_vec![[]],
 	transaction_version: 0,

bridges/relays/bin-substrate/src/chains/kusama.rs

@@ -17,6 +17,8 @@
 use codec::Decode;
 use frame_support::weights::{DispatchClass, DispatchInfo, Pays, Weight};
 use relay_kusama_client::Kusama;
+use sp_core::storage::StorageKey;
+use sp_runtime::{FixedPointNumber, FixedU128};
 use sp_version::RuntimeVersion;
 
 use crate::cli::{
@@ -101,3 +103,14 @@ impl CliChain for Kusama {
 		anyhow::bail!("Sending messages from Kusama is not yet supported.")
 	}
 }
+
+/// Storage key and initial value of Polkadot -> Kusama conversion rate.
+pub(crate) fn polkadot_to_kusama_conversion_rate_params() -> (StorageKey, FixedU128) {
+	(
+		bp_runtime::storage_parameter_key(
+			bp_kusama::POLKADOT_TO_KUSAMA_CONVERSION_RATE_PARAMETER_NAME,
+		),
+		// starting relay before this parameter will be set to some value may cause troubles
+		FixedU128::from_inner(FixedU128::DIV),
+	)
+}

bridges/relays/bin-substrate/src/chains/kusama_headers_to_polkadot.rs

@@ -64,10 +64,7 @@ impl SubstrateFinalitySyncPipeline for KusamaFinalityToPolkadot {
 	type TargetChain = Polkadot;
 
 	fn customize_metrics(params: MetricsParams) -> anyhow::Result<MetricsParams> {
-		crate::chains::add_polkadot_kusama_price_metrics::<Self::FinalitySyncPipeline>(
+		crate::chains::add_polkadot_kusama_price_metrics::<Self::FinalitySyncPipeline>(params)
-			Some(finality_relay::metrics_prefix::<Self::FinalitySyncPipeline>()),
-			params,
-		)
 	}
 
 	fn start_relay_guards(&self) {

bridges/relays/bin-substrate/src/chains/kusama_messages_to_polkadot.rs

@@ -21,7 +21,6 @@ use std::ops::RangeInclusive;
 use codec::Encode;
 use frame_support::weights::Weight;
 use sp_core::{Bytes, Pair};
-use sp_runtime::{FixedPointNumber, FixedU128};
 
 use bp_messages::MessageNonce;
 use bridge_runtime_common::messages::target::FromBridgedChainMessagesProof;
@@ -33,7 +32,6 @@ use relay_polkadot_client::{
 	HeaderId as PolkadotHeaderId, Polkadot, SigningParams as PolkadotSigningParams,
 };
 use relay_substrate_client::{Chain, Client, TransactionSignScheme, UnsignedTransaction};
-use relay_utils::metrics::MetricsParams;
 use substrate_relay_helper::{
 	messages_lane::{
 		select_delivery_transaction_limits, MessagesRelayParams, StandaloneMessagesMetrics,
@@ -196,12 +194,13 @@ pub async fn run(
 
 	let lane_id = params.lane_id;
 	let source_client = params.source_client;
+	let target_client = params.target_client;
 	let lane = KusamaMessagesToPolkadot {
 		message_lane: SubstrateMessageLaneToSubstrate {
 			source_client: source_client.clone(),
 			source_sign: params.source_sign,
 			source_transactions_mortality: params.source_transactions_mortality,
-			target_client: params.target_client.clone(),
+			target_client: target_client.clone(),
 			target_sign: params.target_sign,
 			target_transactions_mortality: params.target_transactions_mortality,
 			relayer_id_at_source: relayer_id_at_kusama,
@@ -240,13 +239,10 @@ pub async fn run(
 		stall_timeout,
 	);
 
-	let (metrics_params, metrics_values) = add_standalone_metrics(
+	let standalone_metrics = params
-		Some(messages_relay::message_lane_loop::metrics_prefix::<
+		.standalone_metrics
-			<KusamaMessagesToPolkadot as SubstrateMessageLane>::MessageLane,
+		.map(Ok)
-		>(&lane_id)),
+		.unwrap_or_else(|| standalone_metrics(source_client.clone(), target_client.clone()))?;
-		params.metrics_params,
-		source_client.clone(),
-	)?;
 	messages_relay::message_lane_loop::run(
 		messages_relay::message_lane_loop::Params {
 			lane: lane_id,
@@ -272,41 +268,31 @@ pub async fn run(
 			params.target_to_source_headers_relay,
 		),
 		PolkadotTargetClient::new(
-			params.target_client,
+			target_client,
 			lane,
 			lane_id,
-			metrics_values,
+			standalone_metrics.clone(),
 			params.source_to_target_headers_relay,
 		),
-		metrics_params,
+		standalone_metrics.register_and_spawn(params.metrics_params)?,
 		futures::future::pending(),
 	)
 	.await
 	.map_err(Into::into)
 }
 
-/// Add standalone metrics for the Kusama -> Polkadot messages loop.
+/// Create standalone metrics for the Kusama -> Polkadot messages loop.
-pub(crate) fn add_standalone_metrics(
+pub(crate) fn standalone_metrics(
-	metrics_prefix: Option<String>,
-	metrics_params: MetricsParams,
 	source_client: Client<Kusama>,
-) -> anyhow::Result<(MetricsParams, StandaloneMessagesMetrics)> {
+	target_client: Client<Polkadot>,
-	let polkadot_to_kusama_conversion_rate_key = bp_runtime::storage_parameter_key(
+) -> anyhow::Result<StandaloneMessagesMetrics<Kusama, Polkadot>> {
-		bp_kusama::POLKADOT_TO_KUSAMA_CONVERSION_RATE_PARAMETER_NAME,
+	substrate_relay_helper::messages_lane::standalone_metrics(
-	)
-	.0;
-
-	substrate_relay_helper::messages_lane::add_standalone_metrics::<KusamaMessagesToPolkadot>(
-		metrics_prefix,
-		metrics_params,
 		source_client,
-		Some(crate::chains::polkadot::TOKEN_ID),
+		target_client,
 		Some(crate::chains::kusama::TOKEN_ID),
-		Some((
+		Some(crate::chains::polkadot::TOKEN_ID),
-			sp_core::storage::StorageKey(polkadot_to_kusama_conversion_rate_key),
+		Some(crate::chains::polkadot::kusama_to_polkadot_conversion_rate_params()),
-			// starting relay before this parameter will be set to some value may cause troubles
+		Some(crate::chains::kusama::polkadot_to_kusama_conversion_rate_params()),
-			FixedU128::from_inner(FixedU128::DIV),
-		)),
 	)
 }
 

bridges/relays/bin-substrate/src/chains/millau.rs

@@ -28,8 +28,17 @@ use bp_message_dispatch::{CallOrigin, MessagePayload};
 use codec::Decode;
 use frame_support::weights::{DispatchInfo, GetDispatchInfo, Weight};
 use relay_millau_client::Millau;
+use sp_core::storage::StorageKey;
+use sp_runtime::FixedU128;
 use sp_version::RuntimeVersion;
 
+// Millau/Rialto tokens have no any real value, so the conversion rate we use is always 1:1. But we
+// want to test our code that is intended to work with real-value chains. So to keep it close to
+// 1:1, we'll be treating Rialto as BTC and Millau as wBTC (only in relayer).
+
+/// The identifier of token, which value is associated with Millau token value by relayer.
+pub(crate) const ASSOCIATED_TOKEN_ID: &str = crate::chains::kusama::TOKEN_ID;
+
 impl CliEncodeCall for Millau {
 	fn max_extrinsic_size() -> u32 {
 		bp_millau::max_extrinsic_size()
@@ -123,3 +132,11 @@ impl CliChain for Millau {
 		}
 	}
 }
+
+/// Storage key and initial value of Rialto -> Millau conversion rate.
+pub(crate) fn rialto_to_millau_conversion_rate_params() -> (StorageKey, FixedU128) {
+	(
+		StorageKey(millau_runtime::rialto_messages::RialtoToMillauConversionRate::key().to_vec()),
+		millau_runtime::rialto_messages::INITIAL_RIALTO_TO_MILLAU_CONVERSION_RATE,
+	)
+}

bridges/relays/bin-substrate/src/chains/millau_messages_to_rialto.rs

@@ -33,7 +33,6 @@ use relay_rialto_client::{
 	HeaderId as RialtoHeaderId, Rialto, SigningParams as RialtoSigningParams,
 };
 use relay_substrate_client::{Chain, Client, IndexOf, TransactionSignScheme, UnsignedTransaction};
-use relay_utils::metrics::MetricsParams;
 use substrate_relay_helper::{
 	messages_lane::{
 		select_delivery_transaction_limits, MessagesRelayParams, StandaloneMessagesMetrics,
@@ -193,12 +192,13 @@ pub async fn run(
 
 	let lane_id = params.lane_id;
 	let source_client = params.source_client;
+	let target_client = params.target_client;
 	let lane = MillauMessagesToRialto {
 		message_lane: SubstrateMessageLaneToSubstrate {
 			source_client: source_client.clone(),
 			source_sign: params.source_sign,
 			source_transactions_mortality: params.source_transactions_mortality,
-			target_client: params.target_client.clone(),
+			target_client: target_client.clone(),
 			target_sign: params.target_sign,
 			target_transactions_mortality: params.target_transactions_mortality,
 			relayer_id_at_source: relayer_id_at_millau,
@@ -234,13 +234,10 @@ pub async fn run(
 		stall_timeout,
 	);
 
-	let (metrics_params, metrics_values) = add_standalone_metrics(
+	let standalone_metrics = params
-		Some(messages_relay::message_lane_loop::metrics_prefix::<
+		.standalone_metrics
-			<MillauMessagesToRialto as SubstrateMessageLane>::MessageLane,
+		.map(Ok)
-		>(&lane_id)),
+		.unwrap_or_else(|| standalone_metrics(source_client.clone(), target_client.clone()))?;
-		params.metrics_params,
-		source_client.clone(),
-	)?;
 	messages_relay::message_lane_loop::run(
 		messages_relay::message_lane_loop::Params {
 			lane: lane_id,
@@ -266,37 +263,31 @@ pub async fn run(
 			params.target_to_source_headers_relay,
 		),
 		RialtoTargetClient::new(
-			params.target_client,
+			target_client,
 			lane,
 			lane_id,
-			metrics_values,
+			standalone_metrics.clone(),
 			params.source_to_target_headers_relay,
 		),
-		metrics_params,
+		standalone_metrics.register_and_spawn(params.metrics_params)?,
 		futures::future::pending(),
 	)
 	.await
 	.map_err(Into::into)
 }
 
-/// Add standalone metrics for the Millau -> Rialto messages loop.
+/// Create standalone metrics for the Millau -> Rialto messages loop.
-pub(crate) fn add_standalone_metrics(
+pub(crate) fn standalone_metrics(
-	metrics_prefix: Option<String>,
-	metrics_params: MetricsParams,
 	source_client: Client<Millau>,
-) -> anyhow::Result<(MetricsParams, StandaloneMessagesMetrics)> {
+	target_client: Client<Rialto>,
-	substrate_relay_helper::messages_lane::add_standalone_metrics::<MillauMessagesToRialto>(
+) -> anyhow::Result<StandaloneMessagesMetrics<Millau, Rialto>> {
-		metrics_prefix,
+	substrate_relay_helper::messages_lane::standalone_metrics(
-		metrics_params,
 		source_client,
-		Some(crate::chains::MILLAU_ASSOCIATED_TOKEN_ID),
+		target_client,
-		Some(crate::chains::RIALTO_ASSOCIATED_TOKEN_ID),
+		Some(crate::chains::millau::ASSOCIATED_TOKEN_ID),
-		Some((
+		Some(crate::chains::rialto::ASSOCIATED_TOKEN_ID),
-			sp_core::storage::StorageKey(
+		Some(crate::chains::rialto::millau_to_rialto_conversion_rate_params()),
-				millau_runtime::rialto_messages::RialtoToMillauConversionRate::key().to_vec(),
+		Some(crate::chains::millau::rialto_to_millau_conversion_rate_params()),
-			),
-			millau_runtime::rialto_messages::INITIAL_RIALTO_TO_MILLAU_CONVERSION_RATE,
-		)),
 	)
 }
 

bridges/relays/bin-substrate/src/chains/mod.rs

@@ -39,31 +39,16 @@ mod rococo;
 mod westend;
 mod wococo;
 
-// Millau/Rialto tokens have no any real value, so the conversion rate we use is always 1:1. But we
+use relay_utils::metrics::{MetricsParams, StandaloneMetric};
-// want to test our code that is intended to work with real-value chains. So to keep it close to
-// 1:1, we'll be treating Rialto as BTC and Millau as wBTC (only in relayer).
-
-/// The identifier of token, which value is associated with Rialto token value by relayer.
-pub(crate) const RIALTO_ASSOCIATED_TOKEN_ID: &str = polkadot::TOKEN_ID;
-/// The identifier of token, which value is associated with Millau token value by relayer.
-pub(crate) const MILLAU_ASSOCIATED_TOKEN_ID: &str = kusama::TOKEN_ID;
-
-use relay_utils::metrics::MetricsParams;
 
 pub(crate) fn add_polkadot_kusama_price_metrics<T: finality_relay::FinalitySyncPipeline>(
-	prefix: Option<String>,
 	params: MetricsParams,
 ) -> anyhow::Result<MetricsParams> {
-	// Polkadot/Kusama prices are added as metrics here, because atm we don't have Polkadot <->
+	substrate_relay_helper::helpers::token_price_metric(polkadot::TOKEN_ID)?
-	// Kusama relays, but we want to test metrics/dashboards in advance
+		.register_and_spawn(&params.registry)?;
-	Ok(relay_utils::relay_metrics(prefix, params)
+	substrate_relay_helper::helpers::token_price_metric(kusama::TOKEN_ID)?
-		.standalone_metric(|registry, prefix| {
+		.register_and_spawn(&params.registry)?;
-			substrate_relay_helper::helpers::token_price_metric(registry, prefix, "polkadot")
+	Ok(params)
-		})?
-		.standalone_metric(|registry, prefix| {
-			substrate_relay_helper::helpers::token_price_metric(registry, prefix, "kusama")
-		})?
-		.into_params())
 }
 
 #[cfg(test)]

bridges/relays/bin-substrate/src/chains/polkadot.rs

@@ -17,6 +17,8 @@
 use codec::Decode;
 use frame_support::weights::{DispatchClass, DispatchInfo, Pays, Weight};
 use relay_polkadot_client::Polkadot;
+use sp_core::storage::StorageKey;
+use sp_runtime::{FixedPointNumber, FixedU128};
 use sp_version::RuntimeVersion;
 
 use crate::cli::{
@@ -101,3 +103,14 @@ impl CliChain for Polkadot {
 		anyhow::bail!("Sending messages from Polkadot is not yet supported.")
 	}
 }
+
+/// Storage key and initial value of Kusama -> Polkadot conversion rate.
+pub(crate) fn kusama_to_polkadot_conversion_rate_params() -> (StorageKey, FixedU128) {
+	(
+		bp_runtime::storage_parameter_key(
+			bp_polkadot::KUSAMA_TO_POLKADOT_CONVERSION_RATE_PARAMETER_NAME,
+		),
+		// starting relay before this parameter will be set to some value may cause troubles
+		FixedU128::from_inner(FixedU128::DIV),
+	)
+}

bridges/relays/bin-substrate/src/chains/polkadot_headers_to_kusama.rs

@@ -64,10 +64,7 @@ impl SubstrateFinalitySyncPipeline for PolkadotFinalityToKusama {
 	type TargetChain = Kusama;
 
 	fn customize_metrics(params: MetricsParams) -> anyhow::Result<MetricsParams> {
-		crate::chains::add_polkadot_kusama_price_metrics::<Self::FinalitySyncPipeline>(
+		crate::chains::add_polkadot_kusama_price_metrics::<Self::FinalitySyncPipeline>(params)
-			Some(finality_relay::metrics_prefix::<Self::FinalitySyncPipeline>()),
-			params,
-		)
 	}
 
 	fn start_relay_guards(&self) {

bridges/relays/bin-substrate/src/chains/polkadot_messages_to_kusama.rs

@@ -32,8 +32,6 @@ use relay_polkadot_client::{
 	HeaderId as PolkadotHeaderId, Polkadot, SigningParams as PolkadotSigningParams,
 };
 use relay_substrate_client::{Chain, Client, TransactionSignScheme, UnsignedTransaction};
-use relay_utils::metrics::MetricsParams;
-use sp_runtime::{FixedPointNumber, FixedU128};
 use substrate_relay_helper::{
 	messages_lane::{
 		select_delivery_transaction_limits, MessagesRelayParams, StandaloneMessagesMetrics,
@@ -195,12 +193,13 @@ pub async fn run(
 
 	let lane_id = params.lane_id;
 	let source_client = params.source_client;
+	let target_client = params.target_client;
 	let lane = PolkadotMessagesToKusama {
 		message_lane: SubstrateMessageLaneToSubstrate {
 			source_client: source_client.clone(),
 			source_sign: params.source_sign,
 			source_transactions_mortality: params.source_transactions_mortality,
-			target_client: params.target_client.clone(),
+			target_client: target_client.clone(),
 			target_sign: params.target_sign,
 			target_transactions_mortality: params.target_transactions_mortality,
 			relayer_id_at_source: relayer_id_at_polkadot,
@@ -239,13 +238,10 @@ pub async fn run(
 		stall_timeout,
 	);
 
-	let (metrics_params, metrics_values) = add_standalone_metrics(
+	let standalone_metrics = params
-		Some(messages_relay::message_lane_loop::metrics_prefix::<
+		.standalone_metrics
-			<PolkadotMessagesToKusama as SubstrateMessageLane>::MessageLane,
+		.map(Ok)
-		>(&lane_id)),
+		.unwrap_or_else(|| standalone_metrics(source_client.clone(), target_client.clone()))?;
-		params.metrics_params,
-		source_client.clone(),
-	)?;
 	messages_relay::message_lane_loop::run(
 		messages_relay::message_lane_loop::Params {
 			lane: lane_id,
@@ -271,41 +267,31 @@ pub async fn run(
 			params.target_to_source_headers_relay,
 		),
 		KusamaTargetClient::new(
-			params.target_client,
+			target_client,
 			lane,
 			lane_id,
-			metrics_values,
+			standalone_metrics.clone(),
 			params.source_to_target_headers_relay,
 		),
-		metrics_params,
+		standalone_metrics.register_and_spawn(params.metrics_params)?,
 		futures::future::pending(),
 	)
 	.await
 	.map_err(Into::into)
 }
 
-/// Add standalone metrics for the Polkadot -> Kusama messages loop.
+/// Create standalone metrics for the Polkadot -> Kusama messages loop.
-pub(crate) fn add_standalone_metrics(
+pub(crate) fn standalone_metrics(
-	metrics_prefix: Option<String>,
-	metrics_params: MetricsParams,
 	source_client: Client<Polkadot>,
-) -> anyhow::Result<(MetricsParams, StandaloneMessagesMetrics)> {
+	target_client: Client<Kusama>,
-	let kusama_to_polkadot_conversion_rate_key = bp_runtime::storage_parameter_key(
+) -> anyhow::Result<StandaloneMessagesMetrics<Polkadot, Kusama>> {
-		bp_polkadot::KUSAMA_TO_POLKADOT_CONVERSION_RATE_PARAMETER_NAME,
+	substrate_relay_helper::messages_lane::standalone_metrics(
-	)
-	.0;
-
-	substrate_relay_helper::messages_lane::add_standalone_metrics::<PolkadotMessagesToKusama>(
-		metrics_prefix,
-		metrics_params,
 		source_client,
-		Some(crate::chains::kusama::TOKEN_ID),
+		target_client,
 		Some(crate::chains::polkadot::TOKEN_ID),
-		Some((
+		Some(crate::chains::kusama::TOKEN_ID),
-			sp_core::storage::StorageKey(kusama_to_polkadot_conversion_rate_key),
+		Some(crate::chains::kusama::polkadot_to_kusama_conversion_rate_params()),
-			// starting relay before this parameter will be set to some value may cause troubles
+		Some(crate::chains::polkadot::kusama_to_polkadot_conversion_rate_params()),
-			FixedU128::from_inner(FixedU128::DIV),
-		)),
 	)
 }
 

bridges/relays/bin-substrate/src/chains/rialto.rs

@@ -28,8 +28,17 @@ use bp_message_dispatch::{CallOrigin, MessagePayload};
 use codec::Decode;
 use frame_support::weights::{DispatchInfo, GetDispatchInfo, Weight};
 use relay_rialto_client::Rialto;
+use sp_core::storage::StorageKey;
+use sp_runtime::FixedU128;
 use sp_version::RuntimeVersion;
 
+// Millau/Rialto tokens have no any real value, so the conversion rate we use is always 1:1. But we
+// want to test our code that is intended to work with real-value chains. So to keep it close to
+// 1:1, we'll be treating Rialto as BTC and Millau as wBTC (only in relayer).
+
+/// The identifier of token, which value is associated with Rialto token value by relayer.
+pub(crate) const ASSOCIATED_TOKEN_ID: &str = crate::chains::polkadot::TOKEN_ID;
+
 impl CliEncodeCall for Rialto {
 	fn max_extrinsic_size() -> u32 {
 		bp_rialto::max_extrinsic_size()
@@ -122,3 +131,11 @@ impl CliChain for Rialto {
 		}
 	}
 }
+
+/// Storage key and initial value of Millau -> Rialto conversion rate.
+pub(crate) fn millau_to_rialto_conversion_rate_params() -> (StorageKey, FixedU128) {
+	(
+		StorageKey(rialto_runtime::millau_messages::MillauToRialtoConversionRate::key().to_vec()),
+		rialto_runtime::millau_messages::INITIAL_MILLAU_TO_RIALTO_CONVERSION_RATE,
+	)
+}

bridges/relays/bin-substrate/src/chains/rialto_messages_to_millau.rs

@@ -33,7 +33,6 @@ use relay_rialto_client::{
 	HeaderId as RialtoHeaderId, Rialto, SigningParams as RialtoSigningParams,
 };
 use relay_substrate_client::{Chain, Client, IndexOf, TransactionSignScheme, UnsignedTransaction};
-use relay_utils::metrics::MetricsParams;
 use substrate_relay_helper::{
 	messages_lane::{
 		select_delivery_transaction_limits, MessagesRelayParams, StandaloneMessagesMetrics,
@@ -193,12 +192,13 @@ pub async fn run(
 
 	let lane_id = params.lane_id;
 	let source_client = params.source_client;
+	let target_client = params.target_client;
 	let lane = RialtoMessagesToMillau {
 		message_lane: SubstrateMessageLaneToSubstrate {
 			source_client: source_client.clone(),
 			source_sign: params.source_sign,
 			source_transactions_mortality: params.source_transactions_mortality,
-			target_client: params.target_client.clone(),
+			target_client: target_client.clone(),
 			target_sign: params.target_sign,
 			target_transactions_mortality: params.target_transactions_mortality,
 			relayer_id_at_source: relayer_id_at_rialto,
@@ -233,13 +233,10 @@ pub async fn run(
 		stall_timeout,
 	);
 
-	let (metrics_params, metrics_values) = add_standalone_metrics(
+	let standalone_metrics = params
-		Some(messages_relay::message_lane_loop::metrics_prefix::<
+		.standalone_metrics
-			<RialtoMessagesToMillau as SubstrateMessageLane>::MessageLane,
+		.map(Ok)
-		>(&lane_id)),
+		.unwrap_or_else(|| standalone_metrics(source_client.clone(), target_client.clone()))?;
-		params.metrics_params,
-		source_client.clone(),
-	)?;
 	messages_relay::message_lane_loop::run(
 		messages_relay::message_lane_loop::Params {
 			lane: lane_id,
@@ -265,37 +262,31 @@ pub async fn run(
 			params.target_to_source_headers_relay,
 		),
 		MillauTargetClient::new(
-			params.target_client,
+			target_client,
 			lane,
 			lane_id,
-			metrics_values,
+			standalone_metrics.clone(),
 			params.source_to_target_headers_relay,
 		),
-		metrics_params,
+		standalone_metrics.register_and_spawn(params.metrics_params)?,
 		futures::future::pending(),
 	)
 	.await
 	.map_err(Into::into)
 }
 
-/// Add standalone metrics for the Rialto -> Millau messages loop.
+/// Create standalone metrics for the Rialto -> Millau messages loop.
-pub(crate) fn add_standalone_metrics(
+pub(crate) fn standalone_metrics(
-	metrics_prefix: Option<String>,
-	metrics_params: MetricsParams,
 	source_client: Client<Rialto>,
-) -> anyhow::Result<(MetricsParams, StandaloneMessagesMetrics)> {
+	target_client: Client<Millau>,
-	substrate_relay_helper::messages_lane::add_standalone_metrics::<RialtoMessagesToMillau>(
+) -> anyhow::Result<StandaloneMessagesMetrics<Rialto, Millau>> {
-		metrics_prefix,
+	substrate_relay_helper::messages_lane::standalone_metrics(
-		metrics_params,
 		source_client,
-		Some(crate::chains::RIALTO_ASSOCIATED_TOKEN_ID),
+		target_client,
-		Some(crate::chains::MILLAU_ASSOCIATED_TOKEN_ID),
+		Some(crate::chains::rialto::ASSOCIATED_TOKEN_ID),
-		Some((
+		Some(crate::chains::millau::ASSOCIATED_TOKEN_ID),
-			sp_core::storage::StorageKey(
+		Some(crate::chains::millau::rialto_to_millau_conversion_rate_params()),
-				rialto_runtime::millau_messages::MillauToRialtoConversionRate::key().to_vec(),
+		Some(crate::chains::rialto::millau_to_rialto_conversion_rate_params()),
-			),
-			rialto_runtime::millau_messages::INITIAL_MILLAU_TO_RIALTO_CONVERSION_RATE,
-		)),
 	)
 }
 

bridges/relays/bin-substrate/src/chains/rococo_headers_to_wococo.rs

@@ -59,10 +59,7 @@ impl SubstrateFinalitySyncPipeline for RococoFinalityToWococo {
 	type TargetChain = Wococo;
 
 	fn customize_metrics(params: MetricsParams) -> anyhow::Result<MetricsParams> {
-		crate::chains::add_polkadot_kusama_price_metrics::<Self::FinalitySyncPipeline>(
+		crate::chains::add_polkadot_kusama_price_metrics::<Self::FinalitySyncPipeline>(params)
-			Some(finality_relay::metrics_prefix::<Self::FinalitySyncPipeline>()),
-			params,
-		)
 	}
 
 	fn start_relay_guards(&self) {

bridges/relays/bin-substrate/src/chains/rococo_messages_to_wococo.rs

@@ -29,7 +29,6 @@ use relay_rococo_client::{
 	HeaderId as RococoHeaderId, Rococo, SigningParams as RococoSigningParams,
 };
 use relay_substrate_client::{Chain, Client, IndexOf, TransactionSignScheme, UnsignedTransaction};
-use relay_utils::metrics::MetricsParams;
 use relay_wococo_client::{
 	HeaderId as WococoHeaderId, SigningParams as WococoSigningParams, Wococo,
 };
@@ -193,12 +192,13 @@ pub async fn run(
 
 	let lane_id = params.lane_id;
 	let source_client = params.source_client;
+	let target_client = params.target_client;
 	let lane = RococoMessagesToWococo {
 		message_lane: SubstrateMessageLaneToSubstrate {
 			source_client: source_client.clone(),
 			source_sign: params.source_sign,
 			source_transactions_mortality: params.source_transactions_mortality,
-			target_client: params.target_client.clone(),
+			target_client: target_client.clone(),
 			target_sign: params.target_sign,
 			target_transactions_mortality: params.target_transactions_mortality,
 			relayer_id_at_source: relayer_id_at_rococo,
@@ -237,13 +237,10 @@ pub async fn run(
 		stall_timeout,
 	);
 
-	let (metrics_params, metrics_values) = add_standalone_metrics(
+	let standalone_metrics = params
-		Some(messages_relay::message_lane_loop::metrics_prefix::<
+		.standalone_metrics
-			<RococoMessagesToWococo as SubstrateMessageLane>::MessageLane,
+		.map(Ok)
-		>(&lane_id)),
+		.unwrap_or_else(|| standalone_metrics(source_client.clone(), target_client.clone()))?;
-		params.metrics_params,
-		source_client.clone(),
-	)?;
 	messages_relay::message_lane_loop::run(
 		messages_relay::message_lane_loop::Params {
 			lane: lane_id,
@@ -269,29 +266,28 @@ pub async fn run(
 			params.target_to_source_headers_relay,
 		),
 		WococoTargetClient::new(
-			params.target_client,
+			target_client,
 			lane,
 			lane_id,
-			metrics_values,
+			standalone_metrics.clone(),
 			params.source_to_target_headers_relay,
 		),
-		metrics_params,
+		standalone_metrics.register_and_spawn(params.metrics_params)?,
 		futures::future::pending(),
 	)
 	.await
 	.map_err(Into::into)
 }
 
-/// Add standalone metrics for the Rococo -> Wococo messages loop.
+/// Create standalone metrics for the Rococo -> Wococo messages loop.
-pub(crate) fn add_standalone_metrics(
+pub(crate) fn standalone_metrics(
-	metrics_prefix: Option<String>,
-	metrics_params: MetricsParams,
 	source_client: Client<Rococo>,
-) -> anyhow::Result<(MetricsParams, StandaloneMessagesMetrics)> {
+	target_client: Client<Wococo>,
-	substrate_relay_helper::messages_lane::add_standalone_metrics::<RococoMessagesToWococo>(
+) -> anyhow::Result<StandaloneMessagesMetrics<Rococo, Wococo>> {
-		metrics_prefix,
+	substrate_relay_helper::messages_lane::standalone_metrics(
-		metrics_params,
 		source_client,
+		target_client,
+		None,
 		None,
 		None,
 		None,

bridges/relays/bin-substrate/src/chains/westend_headers_to_millau.rs

@@ -57,10 +57,7 @@ impl SubstrateFinalitySyncPipeline for WestendFinalityToMillau {
 	type TargetChain = Millau;
 
 	fn customize_metrics(params: MetricsParams) -> anyhow::Result<MetricsParams> {
-		crate::chains::add_polkadot_kusama_price_metrics::<Self::FinalitySyncPipeline>(
+		crate::chains::add_polkadot_kusama_price_metrics::<Self::FinalitySyncPipeline>(params)
-			Some(finality_relay::metrics_prefix::<Self::FinalitySyncPipeline>()),
-			params,
-		)
 	}
 
 	fn transactions_author(&self) -> bp_millau::AccountId {

bridges/relays/bin-substrate/src/chains/wococo_headers_to_rococo.rs

@@ -64,10 +64,7 @@ impl SubstrateFinalitySyncPipeline for WococoFinalityToRococo {
 	type TargetChain = Rococo;
 
 	fn customize_metrics(params: MetricsParams) -> anyhow::Result<MetricsParams> {
-		crate::chains::add_polkadot_kusama_price_metrics::<Self::FinalitySyncPipeline>(
+		crate::chains::add_polkadot_kusama_price_metrics::<Self::FinalitySyncPipeline>(params)
-			Some(finality_relay::metrics_prefix::<Self::FinalitySyncPipeline>()),
-			params,
-		)
 	}
 
 	fn start_relay_guards(&self) {

bridges/relays/bin-substrate/src/chains/wococo_messages_to_rococo.rs

@@ -29,7 +29,6 @@ use relay_rococo_client::{
 	HeaderId as RococoHeaderId, Rococo, SigningParams as RococoSigningParams,
 };
 use relay_substrate_client::{Chain, Client, IndexOf, TransactionSignScheme, UnsignedTransaction};
-use relay_utils::metrics::MetricsParams;
 use relay_wococo_client::{
 	HeaderId as WococoHeaderId, SigningParams as WococoSigningParams, Wococo,
 };
@@ -192,12 +191,13 @@ pub async fn run(
 
 	let lane_id = params.lane_id;
 	let source_client = params.source_client;
+	let target_client = params.target_client;
 	let lane = WococoMessagesToRococo {
 		message_lane: SubstrateMessageLaneToSubstrate {
 			source_client: source_client.clone(),
 			source_sign: params.source_sign,
 			source_transactions_mortality: params.source_transactions_mortality,
-			target_client: params.target_client.clone(),
+			target_client: target_client.clone(),
 			target_sign: params.target_sign,
 			target_transactions_mortality: params.target_transactions_mortality,
 			relayer_id_at_source: relayer_id_at_wococo,
@@ -236,13 +236,10 @@ pub async fn run(
 		stall_timeout,
 	);
 
-	let (metrics_params, metrics_values) = add_standalone_metrics(
+	let standalone_metrics = params
-		Some(messages_relay::message_lane_loop::metrics_prefix::<
+		.standalone_metrics
-			<WococoMessagesToRococo as SubstrateMessageLane>::MessageLane,
+		.map(Ok)
-		>(&lane_id)),
+		.unwrap_or_else(|| standalone_metrics(source_client.clone(), target_client.clone()))?;
-		params.metrics_params,
-		source_client.clone(),
-	)?;
 	messages_relay::message_lane_loop::run(
 		messages_relay::message_lane_loop::Params {
 			lane: lane_id,
@@ -268,29 +265,28 @@ pub async fn run(
 			params.target_to_source_headers_relay,
 		),
 		RococoTargetClient::new(
-			params.target_client,
+			target_client,
 			lane,
 			lane_id,
-			metrics_values,
+			standalone_metrics.clone(),
 			params.source_to_target_headers_relay,
 		),
-		metrics_params,
+		standalone_metrics.register_and_spawn(params.metrics_params)?,
 		futures::future::pending(),
 	)
 	.await
 	.map_err(Into::into)
 }
 
-/// Add standalone metrics for the Wococo -> Rococo messages loop.
+/// Create standalone metrics for the Wococo -> Rococo messages loop.
-pub(crate) fn add_standalone_metrics(
+pub(crate) fn standalone_metrics(
-	metrics_prefix: Option<String>,
-	metrics_params: MetricsParams,
 	source_client: Client<Wococo>,
-) -> anyhow::Result<(MetricsParams, StandaloneMessagesMetrics)> {
+	target_client: Client<Rococo>,
-	substrate_relay_helper::messages_lane::add_standalone_metrics::<WococoMessagesToRococo>(
+) -> anyhow::Result<StandaloneMessagesMetrics<Wococo, Rococo>> {
-		metrics_prefix,
+	substrate_relay_helper::messages_lane::standalone_metrics(
-		metrics_params,
 		source_client,
+		target_client,
+		None,
 		None,
 		None,
 		None,

bridges/relays/bin-substrate/src/cli/relay_headers.rs

@@ -17,6 +17,7 @@
 use structopt::StructOpt;
 use strum::{EnumString, EnumVariantNames, VariantNames};
 
+use relay_utils::metrics::{GlobalMetrics, StandaloneMetric};
 use substrate_relay_helper::finality_pipeline::SubstrateFinalitySyncPipeline;
 
 use crate::cli::{
@@ -121,6 +122,8 @@ impl RelayHeaders {
 			let target_transactions_mortality = self.target_sign.target_transactions_mortality;
 			let target_sign = self.target_sign.to_keypair::<Target>()?;
 			let metrics_params = Finality::customize_metrics(self.prometheus_params.into())?;
+			GlobalMetrics::new()?.register_and_spawn(&metrics_params.registry)?;
+
 			let finality = Finality::new(target_client.clone(), target_sign);
 			finality.start_relay_guards();
 

bridges/relays/bin-substrate/src/cli/relay_headers_and_messages.rs

@@ -34,8 +34,7 @@ use relay_substrate_client::{
 use relay_utils::metrics::MetricsParams;
 use sp_core::{Bytes, Pair};
 use substrate_relay_helper::{
-	messages_lane::{MessagesRelayParams, SubstrateMessageLane},
+	messages_lane::MessagesRelayParams, on_demand_headers::OnDemandHeadersRelay,
-	on_demand_headers::OnDemandHeadersRelay,
 };
 
 use crate::{
@@ -129,11 +128,6 @@ macro_rules! select_bridge {
 				type RightToLeftFinality =
 					crate::chains::rialto_headers_to_millau::RialtoFinalityToMillau;
 
-				type LeftToRightMessages =
-					crate::chains::millau_messages_to_rialto::MillauMessagesToRialto;
-				type RightToLeftMessages =
-					crate::chains::rialto_messages_to_millau::RialtoMessagesToMillau;
-
 				type LeftAccountIdConverter = bp_millau::AccountIdConverter;
 				type RightAccountIdConverter = bp_rialto::AccountIdConverter;
 
@@ -144,12 +138,11 @@ macro_rules! select_bridge {
 
 				use crate::chains::{
 					millau_messages_to_rialto::{
-						add_standalone_metrics as add_left_to_right_standalone_metrics,
+						standalone_metrics as left_to_right_standalone_metrics,
 						run as left_to_right_messages,
 						update_rialto_to_millau_conversion_rate as update_right_to_left_conversion_rate,
 					},
 					rialto_messages_to_millau::{
-						add_standalone_metrics as add_right_to_left_standalone_metrics,
 						run as right_to_left_messages,
 						update_millau_to_rialto_conversion_rate as update_left_to_right_conversion_rate,
 					},
@@ -184,11 +177,6 @@ macro_rules! select_bridge {
 				type RightToLeftFinality =
 					crate::chains::wococo_headers_to_rococo::WococoFinalityToRococo;
 
-				type LeftToRightMessages =
-					crate::chains::rococo_messages_to_wococo::RococoMessagesToWococo;
-				type RightToLeftMessages =
-					crate::chains::wococo_messages_to_rococo::WococoMessagesToRococo;
-
 				type LeftAccountIdConverter = bp_rococo::AccountIdConverter;
 				type RightAccountIdConverter = bp_wococo::AccountIdConverter;
 
@@ -199,11 +187,10 @@ macro_rules! select_bridge {
 
 				use crate::chains::{
 					rococo_messages_to_wococo::{
-						add_standalone_metrics as add_left_to_right_standalone_metrics,
+						standalone_metrics as left_to_right_standalone_metrics,
 						run as left_to_right_messages,
 					},
 					wococo_messages_to_rococo::{
-						add_standalone_metrics as add_right_to_left_standalone_metrics,
 						run as right_to_left_messages,
 					},
 				};
@@ -253,11 +240,6 @@ macro_rules! select_bridge {
 				type RightToLeftFinality =
 					crate::chains::polkadot_headers_to_kusama::PolkadotFinalityToKusama;
 
-				type LeftToRightMessages =
-					crate::chains::kusama_messages_to_polkadot::KusamaMessagesToPolkadot;
-				type RightToLeftMessages =
-					crate::chains::polkadot_messages_to_kusama::PolkadotMessagesToKusama;
-
 				type LeftAccountIdConverter = bp_kusama::AccountIdConverter;
 				type RightAccountIdConverter = bp_polkadot::AccountIdConverter;
 
@@ -268,12 +250,11 @@ macro_rules! select_bridge {
 
 				use crate::chains::{
 					kusama_messages_to_polkadot::{
-						add_standalone_metrics as add_left_to_right_standalone_metrics,
+						standalone_metrics as left_to_right_standalone_metrics,
 						run as left_to_right_messages,
 						update_polkadot_to_kusama_conversion_rate as update_right_to_left_conversion_rate,
 					},
 					polkadot_messages_to_kusama::{
-						add_standalone_metrics as add_right_to_left_standalone_metrics,
 						run as right_to_left_messages,
 						update_kusama_to_polkadot_conversion_rate as update_left_to_right_conversion_rate,
 					},
@@ -378,31 +359,39 @@ impl RelayHeadersAndMessages {
 			let relayer_mode = params.shared.relayer_mode.into();
 			let relay_strategy = MixStrategy::new(relayer_mode);
 
-			const METRIC_IS_SOME_PROOF: &str =
+			// create metrics registry and register standalone metrics
-				"it is `None` when metric has been already registered; \
-				this is the command entrypoint, so nothing has been registered yet; \
-				qed";
-
 			let metrics_params: MetricsParams = params.shared.prometheus_params.into();
-			let metrics_params = relay_utils::relay_metrics(None, metrics_params).into_params();
+			let metrics_params = relay_utils::relay_metrics(metrics_params).into_params();
-			let (metrics_params, left_to_right_metrics) =
+			let left_to_right_metrics =
-				add_left_to_right_standalone_metrics(None, metrics_params, left_client.clone())?;
+				left_to_right_standalone_metrics(left_client.clone(), right_client.clone())?;
-			let (metrics_params, right_to_left_metrics) =
+			let right_to_left_metrics = left_to_right_metrics.clone().reverse();
-				add_right_to_left_standalone_metrics(None, metrics_params, right_client.clone())?;
+
+			// start conversion rate update loops for left/right chains
 			if let Some(left_messages_pallet_owner) = left_messages_pallet_owner {
 				let left_client = left_client.clone();
+				let format_err = || {
+					anyhow::format_err!(
+						"Cannon run conversion rate updater: {} -> {}",
+						Right::NAME,
+						Left::NAME
+					)
+				};
 				substrate_relay_helper::conversion_rate_update::run_conversion_rate_update_loop(
 					left_to_right_metrics
 						.target_to_source_conversion_rate
-						.expect(METRIC_IS_SOME_PROOF),
+						.as_ref()
+						.ok_or_else(format_err)?
+						.shared_value_ref(),
 					left_to_right_metrics
 						.target_to_base_conversion_rate
-						.clone()
+						.as_ref()
-						.expect(METRIC_IS_SOME_PROOF),
+						.ok_or_else(format_err)?
+						.shared_value_ref(),
 					left_to_right_metrics
 						.source_to_base_conversion_rate
-						.clone()
+						.as_ref()
-						.expect(METRIC_IS_SOME_PROOF),
+						.ok_or_else(format_err)?
+						.shared_value_ref(),
 					CONVERSION_RATE_ALLOWED_DIFFERENCE_RATIO,
 					move |new_rate| {
 						log::info!(
@@ -423,16 +412,29 @@ impl RelayHeadersAndMessages {
 			}
 			if let Some(right_messages_pallet_owner) = right_messages_pallet_owner {
 				let right_client = right_client.clone();
+				let format_err = || {
+					anyhow::format_err!(
+						"Cannon run conversion rate updater: {} -> {}",
+						Left::NAME,
+						Right::NAME
+					)
+				};
 				substrate_relay_helper::conversion_rate_update::run_conversion_rate_update_loop(
 					right_to_left_metrics
 						.target_to_source_conversion_rate
-						.expect(METRIC_IS_SOME_PROOF),
+						.as_ref()
+						.ok_or_else(format_err)?
+						.shared_value_ref(),
 					left_to_right_metrics
 						.source_to_base_conversion_rate
-						.expect(METRIC_IS_SOME_PROOF),
+						.as_ref()
+						.ok_or_else(format_err)?
+						.shared_value_ref(),
 					left_to_right_metrics
 						.target_to_base_conversion_rate
-						.expect(METRIC_IS_SOME_PROOF),
+						.as_ref()
+						.ok_or_else(format_err)?
+						.shared_value_ref(),
 					CONVERSION_RATE_ALLOWED_DIFFERENCE_RATIO,
 					move |new_rate| {
 						log::info!(
@@ -452,6 +454,7 @@ impl RelayHeadersAndMessages {
 				);
 			}
 
+			// optionally, create relayers fund account
 			if params.shared.create_relayers_fund_accounts {
 				let relayer_fund_acount_id = pallet_bridge_messages::relayer_fund_account_id::<
 					AccountIdOf<Left>,
@@ -490,6 +493,7 @@ impl RelayHeadersAndMessages {
 				}
 			}
 
+			// start on-demand header relays
 			let left_to_right_on_demand_headers = OnDemandHeadersRelay::new(
 				left_client.clone(),
 				right_client.clone(),
@@ -521,11 +525,8 @@ impl RelayHeadersAndMessages {
 					source_to_target_headers_relay: Some(left_to_right_on_demand_headers.clone()),
 					target_to_source_headers_relay: Some(right_to_left_on_demand_headers.clone()),
 					lane_id: lane,
-					metrics_params: metrics_params.clone().disable().metrics_prefix(
+					metrics_params: metrics_params.clone().disable(),
-						messages_relay::message_lane_loop::metrics_prefix::<
+					standalone_metrics: Some(left_to_right_metrics.clone()),
-							<LeftToRightMessages as SubstrateMessageLane>::MessageLane,
-						>(&lane),
-					),
 					relay_strategy: relay_strategy.clone(),
 				})
 				.map_err(|e| anyhow::format_err!("{}", e))
@@ -540,11 +541,8 @@ impl RelayHeadersAndMessages {
 					source_to_target_headers_relay: Some(right_to_left_on_demand_headers.clone()),
 					target_to_source_headers_relay: Some(left_to_right_on_demand_headers.clone()),
 					lane_id: lane,
-					metrics_params: metrics_params.clone().disable().metrics_prefix(
+					metrics_params: metrics_params.clone().disable(),
-						messages_relay::message_lane_loop::metrics_prefix::<
+					standalone_metrics: Some(right_to_left_metrics.clone()),
-							<RightToLeftMessages as SubstrateMessageLane>::MessageLane,
-						>(&lane),
-					),
 					relay_strategy: relay_strategy.clone(),
 				})
 				.map_err(|e| anyhow::format_err!("{}", e))
@@ -554,7 +552,7 @@ impl RelayHeadersAndMessages {
 				message_relays.push(right_to_left_messages);
 			}
 
-			relay_utils::relay_metrics(None, metrics_params)
+			relay_utils::relay_metrics(metrics_params)
 				.expose()
 				.await
 				.map_err(|e| anyhow::format_err!("{}", e))?;

bridges/relays/bin-substrate/src/cli/relay_messages.rs

@@ -95,6 +95,7 @@ impl RelayMessages {
 				target_to_source_headers_relay: None,
 				lane_id: self.lane.into(),
 				metrics_params: self.prometheus_params.into(),
+				standalone_metrics: None,
 				relay_strategy,
 			})
 			.await

bridges/relays/client-substrate/src/metrics/float_storage_value.rs

@@ -20,7 +20,8 @@ use async_std::sync::{Arc, RwLock};
 use async_trait::async_trait;
 use codec::Decode;
 use relay_utils::metrics::{
-	metric_name, register, F64SharedRef, Gauge, PrometheusError, Registry, StandaloneMetrics, F64,
+	metric_name, register, F64SharedRef, Gauge, Metric, PrometheusError, Registry,
+	StandaloneMetric, F64,
 };
 use sp_core::storage::StorageKey;
 use sp_runtime::{traits::UniqueSaturatedInto, FixedPointNumber};
@@ -42,8 +43,6 @@ pub struct FloatStorageValueMetric<C: Chain, T: Clone> {
 impl<C: Chain, T: Decode + FixedPointNumber> FloatStorageValueMetric<C, T> {
 	/// Create new metric.
 	pub fn new(
-		registry: &Registry,
-		prefix: Option<&str>,
 		client: Client<C>,
 		storage_key: StorageKey,
 		maybe_default_value: Option<T>,
@@ -55,7 +54,7 @@ impl<C: Chain, T: Decode + FixedPointNumber> FloatStorageValueMetric<C, T> {
 			client,
 			storage_key,
 			maybe_default_value,
-			metric: register(Gauge::new(metric_name(prefix, &name), help)?, registry)?,
+			metric: Gauge::new(metric_name(None, &name), help)?,
 			shared_value_ref,
 		})
 	}
@@ -66,8 +65,17 @@ impl<C: Chain, T: Decode + FixedPointNumber> FloatStorageValueMetric<C, T> {
 	}
 }
 
+impl<C: Chain, T> Metric for FloatStorageValueMetric<C, T>
+where
+	T: 'static + Decode + Send + Sync + FixedPointNumber,
+{
+	fn register(&self, registry: &Registry) -> Result<(), PrometheusError> {
+		register(self.metric.clone(), registry).map(drop)
+	}
+}
+
 #[async_trait]
-impl<C: Chain, T> StandaloneMetrics for FloatStorageValueMetric<C, T>
+impl<C: Chain, T> StandaloneMetric for FloatStorageValueMetric<C, T>
 where
 	T: 'static + Decode + Send + Sync + FixedPointNumber,
 {

bridges/relays/client-substrate/src/metrics/storage_proof_overhead.rs

@@ -18,7 +18,7 @@ use crate::{chain::Chain, client::Client, error::Error};
 
 use async_trait::async_trait;
 use relay_utils::metrics::{
-	metric_name, register, Gauge, PrometheusError, Registry, StandaloneMetrics, U64,
+	metric_name, register, Gauge, Metric, PrometheusError, Registry, StandaloneMetric, U64,
 };
 use sp_core::storage::StorageKey;
 use sp_runtime::traits::Header as HeaderT;
@@ -46,16 +46,10 @@ impl<C: Chain> Clone for StorageProofOverheadMetric<C> {
 
 impl<C: Chain> StorageProofOverheadMetric<C> {
 	/// Create new metric instance with given name and help.
-	pub fn new(
+	pub fn new(client: Client<C>, name: String, help: String) -> Result<Self, PrometheusError> {
-		registry: &Registry,
-		prefix: Option<&str>,
-		client: Client<C>,
-		name: String,
-		help: String,
-	) -> Result<Self, PrometheusError> {
 		Ok(StorageProofOverheadMetric {
 			client,
-			metric: register(Gauge::new(metric_name(prefix, &name), help)?, registry)?,
+			metric: Gauge::new(metric_name(None, &name), help)?,
 		})
 	}
 
@@ -84,8 +78,14 @@ impl<C: Chain> StorageProofOverheadMetric<C> {
 	}
 }
 
+impl<C: Chain> Metric for StorageProofOverheadMetric<C> {
+	fn register(&self, registry: &Registry) -> Result<(), PrometheusError> {
+		register(self.metric.clone(), registry).map(drop)
+	}
+}
+
 #[async_trait]
-impl<C: Chain> StandaloneMetrics for StorageProofOverheadMetric<C> {
+impl<C: Chain> StandaloneMetric for StorageProofOverheadMetric<C> {
 	fn update_interval(&self) -> Duration {
 		C::AVERAGE_BLOCK_INTERVAL * UPDATE_INTERVAL_IN_BLOCKS
 	}

bridges/relays/finality/src/finality_loop.rs

@@ -28,9 +28,8 @@ use backoff::backoff::Backoff;
 use futures::{select, Future, FutureExt, Stream, StreamExt};
 use num_traits::{One, Saturating};
 use relay_utils::{
-	metrics::{GlobalMetrics, MetricsParams},
+	metrics::MetricsParams, relay_loop::Client as RelayClient, retry_backoff, FailedClient,
-	relay_loop::Client as RelayClient,
+	MaybeConnectionError,
-	retry_backoff, FailedClient, MaybeConnectionError,
 };
 use std::{
 	pin::Pin,
@@ -114,9 +113,8 @@ pub async fn run<P: FinalitySyncPipeline>(
 ) -> Result<(), relay_utils::Error> {
 	let exit_signal = exit_signal.shared();
 	relay_utils::relay_loop(source_client, target_client)
-		.with_metrics(Some(metrics_prefix::<P>()), metrics_params)
+		.with_metrics(metrics_params)
-		.loop_metric(SyncLoopMetrics::new)?
+		.loop_metric(SyncLoopMetrics::new(Some(&metrics_prefix::<P>()))?)?
-		.standalone_metric(GlobalMetrics::new)?
 		.expose()
 		.await?
 		.run(metrics_prefix::<P>(), move |source_client, target_client, metrics| {

bridges/relays/finality/src/sync_loop_metrics.rs

@@ -16,7 +16,9 @@
 
 //! Metrics for headers synchronization relay loop.
 
-use relay_utils::metrics::{metric_name, register, GaugeVec, Opts, PrometheusError, Registry, U64};
+use relay_utils::metrics::{
+	metric_name, register, GaugeVec, Metric, Opts, PrometheusError, Registry, U64,
+};
 
 /// Headers sync metrics.
 #[derive(Clone)]
@@ -27,23 +29,18 @@ pub struct SyncLoopMetrics {
 
 impl SyncLoopMetrics {
 	/// Create and register headers loop metrics.
-	pub fn new(registry: &Registry, prefix: Option<&str>) -> Result<Self, PrometheusError> {
+	pub fn new(prefix: Option<&str>) -> Result<Self, PrometheusError> {
 		Ok(SyncLoopMetrics {
-			best_block_numbers: register(
+			best_block_numbers: GaugeVec::new(
-				GaugeVec::new(
+				Opts::new(
-					Opts::new(
+					metric_name(prefix, "best_block_numbers"),
-						metric_name(prefix, "best_block_numbers"),
+					"Best block numbers on source and target nodes",
-						"Best block numbers on source and target nodes",
+				),
-					),
+				&["node"],
-					&["node"],
-				)?,
-				registry,
 			)?,
 		})
 	}
-}
 
-impl SyncLoopMetrics {
 	/// Update best block number at source.
 	pub fn update_best_block_at_source<Number: Into<u64>>(&self, source_best_number: Number) {
 		self.best_block_numbers
@@ -58,3 +55,10 @@ impl SyncLoopMetrics {
 			.set(target_best_number.into());
 	}
 }
+
+impl Metric for SyncLoopMetrics {
+	fn register(&self, registry: &Registry) -> Result<(), PrometheusError> {
+		register(self.best_block_numbers.clone(), registry)?;
+		Ok(())
+	}
+}

bridges/relays/lib-substrate-relay/src/helpers.rs

@@ -16,17 +16,11 @@
 
 //! Substrate relay helpers
 
-use relay_utils::metrics::{FloatJsonValueMetric, PrometheusError, Registry};
+use relay_utils::metrics::{FloatJsonValueMetric, PrometheusError};
 
 /// Creates standalone token price metric.
-pub fn token_price_metric(
+pub fn token_price_metric(token_id: &str) -> Result<FloatJsonValueMetric, PrometheusError> {
-	registry: &Registry,
-	prefix: Option<&str>,
-	token_id: &str,
-) -> Result<FloatJsonValueMetric, PrometheusError> {
 	FloatJsonValueMetric::new(
-		registry,
-		prefix,
 		format!("https://api.coingecko.com/api/v3/simple/price?ids={}&vs_currencies=btc", token_id),
 		format!("$.{}.btc", token_id),
 		format!("{}_to_base_conversion_rate", token_id.replace("-", "_")),

bridges/relays/lib-substrate-relay/src/messages_lane.rs

@@ -34,7 +34,9 @@ use relay_substrate_client::{
 	BlockNumberOf, Chain, Client, HashOf,
 };
 use relay_utils::{
-	metrics::{F64SharedRef, MetricsParams},
+	metrics::{
+		FloatJsonValueMetric, GlobalMetrics, MetricsParams, PrometheusError, StandaloneMetric,
+	},
 	BlockNumberBase,
 };
 use sp_core::{storage::StorageKey, Bytes};
@@ -63,6 +65,8 @@ pub struct MessagesRelayParams<SC: Chain, SS, TC: Chain, TS, Strategy: RelayStra
 	pub lane_id: LaneId,
 	/// Metrics parameters.
 	pub metrics_params: MetricsParams,
+	/// Pre-registered standalone metrics.
+	pub standalone_metrics: Option<StandaloneMessagesMetrics<SC, TC>>,
 	/// Relay strategy
 	pub relay_strategy: Strategy,
 }
@@ -241,110 +245,155 @@ pub fn select_delivery_transaction_limits<W: pallet_bridge_messages::WeightInfoE
 	(max_number_of_messages, weight_for_messages_dispatch)
 }
 
-/// Shared references to the values of standalone metrics of the message lane relay loop.
+/// Shared references to the standalone metrics of the message lane relay loop.
 #[derive(Debug, Clone)]
-pub struct StandaloneMessagesMetrics {
+pub struct StandaloneMessagesMetrics<SC: Chain, TC: Chain> {
-	/// Shared reference to the actual target -> <base> chain token conversion rate.
+	/// Global metrics.
-	pub target_to_base_conversion_rate: Option<F64SharedRef>,
+	pub global: GlobalMetrics,
-	/// Shared reference to the actual source -> <base> chain token conversion rate.
+	/// Storage chain proof overhead metric.
-	pub source_to_base_conversion_rate: Option<F64SharedRef>,
+	pub source_storage_proof_overhead: StorageProofOverheadMetric<SC>,
-	/// Shared reference to the stored (in the source chain runtime storage) target -> source chain
+	/// Target chain proof overhead metric.
-	/// conversion rate.
+	pub target_storage_proof_overhead: StorageProofOverheadMetric<TC>,
-	pub target_to_source_conversion_rate: Option<F64SharedRef>,
+	/// Source tokens to base conversion rate metric.
+	pub source_to_base_conversion_rate: Option<FloatJsonValueMetric>,
+	/// Target tokens to base conversion rate metric.
+	pub target_to_base_conversion_rate: Option<FloatJsonValueMetric>,
+	/// Source tokens to target tokens conversion rate metric. This rate is stored by the target
+	/// chain.
+	pub source_to_target_conversion_rate:
+		Option<FloatStorageValueMetric<TC, sp_runtime::FixedU128>>,
+	/// Target tokens to source tokens conversion rate metric. This rate is stored by the source
+	/// chain.
+	pub target_to_source_conversion_rate:
+		Option<FloatStorageValueMetric<SC, sp_runtime::FixedU128>>,
 }
 
-impl StandaloneMessagesMetrics {
+impl<SC: Chain, TC: Chain> StandaloneMessagesMetrics<SC, TC> {
+	/// Swap source and target sides.
+	pub fn reverse(self) -> StandaloneMessagesMetrics<TC, SC> {
+		StandaloneMessagesMetrics {
+			global: self.global,
+			source_storage_proof_overhead: self.target_storage_proof_overhead,
+			target_storage_proof_overhead: self.source_storage_proof_overhead,
+			source_to_base_conversion_rate: self.target_to_base_conversion_rate,
+			target_to_base_conversion_rate: self.source_to_base_conversion_rate,
+			source_to_target_conversion_rate: self.target_to_source_conversion_rate,
+			target_to_source_conversion_rate: self.source_to_target_conversion_rate,
+		}
+	}
+
+	/// Register all metrics in the registry.
+	pub fn register_and_spawn(
+		self,
+		metrics: MetricsParams,
+	) -> Result<MetricsParams, PrometheusError> {
+		self.global.register_and_spawn(&metrics.registry)?;
+		self.source_storage_proof_overhead.register_and_spawn(&metrics.registry)?;
+		self.target_storage_proof_overhead.register_and_spawn(&metrics.registry)?;
+		if let Some(m) = self.source_to_base_conversion_rate {
+			m.register_and_spawn(&metrics.registry)?;
+		}
+		if let Some(m) = self.target_to_base_conversion_rate {
+			m.register_and_spawn(&metrics.registry)?;
+		}
+		if let Some(m) = self.target_to_source_conversion_rate {
+			m.register_and_spawn(&metrics.registry)?;
+		}
+		Ok(metrics)
+	}
+
 	/// Return conversion rate from target to source tokens.
 	pub async fn target_to_source_conversion_rate(&self) -> Option<f64> {
-		let target_to_base_conversion_rate =
+		Self::compute_target_to_source_conversion_rate(
-			(*self.target_to_base_conversion_rate.as_ref()?.read().await)?;
+			*self.target_to_base_conversion_rate.as_ref()?.shared_value_ref().read().await,
-		let source_to_base_conversion_rate =
+			*self.source_to_base_conversion_rate.as_ref()?.shared_value_ref().read().await,
-			(*self.source_to_base_conversion_rate.as_ref()?.read().await)?;
+		)
-		Some(source_to_base_conversion_rate / target_to_base_conversion_rate)
+	}
+
+	/// Return conversion rate from target to source tokens, given conversion rates from
+	/// target/source tokens to some base token.
+	fn compute_target_to_source_conversion_rate(
+		target_to_base_conversion_rate: Option<f64>,
+		source_to_base_conversion_rate: Option<f64>,
+	) -> Option<f64> {
+		Some(source_to_base_conversion_rate? / target_to_base_conversion_rate?)
 	}
 }
 
-/// Add general standalone metrics for the message lane relay loop.
+/// Create standalone metrics for the message lane relay loop.
-pub fn add_standalone_metrics<P: SubstrateMessageLane>(
+///
-	metrics_prefix: Option<String>,
+/// All metrics returned by this function are exposed by loops that are serving given lane (`P`)
-	metrics_params: MetricsParams,
+/// and by loops that are serving reverse lane (`P` with swapped `TargetChain` and `SourceChain`).
-	source_client: Client<P::SourceChain>,
+pub fn standalone_metrics<SC: Chain, TC: Chain>(
+	source_client: Client<SC>,
+	target_client: Client<TC>,
 	source_chain_token_id: Option<&str>,
 	target_chain_token_id: Option<&str>,
+	source_to_target_conversion_rate_params: Option<(StorageKey, FixedU128)>,
 	target_to_source_conversion_rate_params: Option<(StorageKey, FixedU128)>,
-) -> anyhow::Result<(MetricsParams, StandaloneMessagesMetrics)> {
+) -> anyhow::Result<StandaloneMessagesMetrics<SC, TC>> {
-	let mut target_to_source_conversion_rate = None;
+	Ok(StandaloneMessagesMetrics {
-	let mut source_to_base_conversion_rate = None;
+		global: GlobalMetrics::new()?,
-	let mut target_to_base_conversion_rate = None;
+		source_storage_proof_overhead: StorageProofOverheadMetric::new(
-	let mut metrics_params = relay_utils::relay_metrics(metrics_prefix, metrics_params)
+			source_client.clone(),
-		.standalone_metric(|registry, prefix| {
+			format!("{}_storage_proof_overhead", SC::NAME.to_lowercase()),
-			StorageProofOverheadMetric::new(
+			format!("{} storage proof overhead", SC::NAME),
-				registry,
+		)?,
-				prefix,
+		target_storage_proof_overhead: StorageProofOverheadMetric::new(
-				source_client.clone(),
+			target_client.clone(),
-				format!("{}_storage_proof_overhead", P::SourceChain::NAME.to_lowercase()),
+			format!("{}_storage_proof_overhead", TC::NAME.to_lowercase()),
-				format!("{} storage proof overhead", P::SourceChain::NAME),
+			format!("{} storage proof overhead", TC::NAME),
-			)
+		)?,
-		})?;
+		source_to_base_conversion_rate: source_chain_token_id
-	if let Some((
+			.map(|source_chain_token_id| {
-		target_to_source_conversion_rate_storage_key,
+				crate::helpers::token_price_metric(source_chain_token_id).map(Some)
-		initial_target_to_source_conversion_rate,
+			})
-	)) = target_to_source_conversion_rate_params
+			.unwrap_or(Ok(None))?,
-	{
+		target_to_base_conversion_rate: target_chain_token_id
-		metrics_params = metrics_params.standalone_metric(|registry, prefix| {
+			.map(|target_chain_token_id| {
-			let metric = FloatStorageValueMetric::<_, sp_runtime::FixedU128>::new(
+				crate::helpers::token_price_metric(target_chain_token_id).map(Some)
-				registry,
+			})
-				prefix,
+			.unwrap_or(Ok(None))?,
-				source_client,
+		source_to_target_conversion_rate: source_to_target_conversion_rate_params
-				target_to_source_conversion_rate_storage_key,
+			.map(|(key, rate)| {
-				Some(initial_target_to_source_conversion_rate),
+				FloatStorageValueMetric::<_, sp_runtime::FixedU128>::new(
-				format!(
+					target_client,
-					"{}_{}_to_{}_conversion_rate",
+					key,
-					P::SourceChain::NAME,
+					Some(rate),
-					P::TargetChain::NAME,
+					format!("{}_{}_to_{}_conversion_rate", TC::NAME, SC::NAME, TC::NAME),
-					P::SourceChain::NAME
+					format!(
-				),
+						"{} to {} tokens conversion rate (used by {})",
-				format!(
+						SC::NAME,
-					"{} to {} tokens conversion rate (used by {})",
+						TC::NAME,
-					P::TargetChain::NAME,
+						TC::NAME
-					P::SourceChain::NAME,
+					),
-					P::SourceChain::NAME
+				)
-				),
+				.map(Some)
-			)?;
+			})
-			target_to_source_conversion_rate = Some(metric.shared_value_ref());
+			.unwrap_or(Ok(None))?,
-			Ok(metric)
+		target_to_source_conversion_rate: target_to_source_conversion_rate_params
-		})?;
+			.map(|(key, rate)| {
-	}
+				FloatStorageValueMetric::<_, sp_runtime::FixedU128>::new(
-	if let Some(source_chain_token_id) = source_chain_token_id {
+					source_client,
-		metrics_params = metrics_params.standalone_metric(|registry, prefix| {
+					key,
-			let metric =
+					Some(rate),
-				crate::helpers::token_price_metric(registry, prefix, source_chain_token_id)?;
+					format!("{}_{}_to_{}_conversion_rate", SC::NAME, TC::NAME, SC::NAME),
-			source_to_base_conversion_rate = Some(metric.shared_value_ref());
+					format!(
-			Ok(metric)
+						"{} to {} tokens conversion rate (used by {})",
-		})?;
+						TC::NAME,
-	}
+						SC::NAME,
-	if let Some(target_chain_token_id) = target_chain_token_id {
+						SC::NAME
-		metrics_params = metrics_params.standalone_metric(|registry, prefix| {
+					),
-			let metric =
+				)
-				crate::helpers::token_price_metric(registry, prefix, target_chain_token_id)?;
+				.map(Some)
-			target_to_base_conversion_rate = Some(metric.shared_value_ref());
+			})
-			Ok(metric)
+			.unwrap_or(Ok(None))?,
-		})?;
+	})
-	}
-	Ok((
-		metrics_params.into_params(),
-		StandaloneMessagesMetrics {
-			target_to_base_conversion_rate,
-			source_to_base_conversion_rate,
-			target_to_source_conversion_rate,
-		},
-	))
 }
 
 #[cfg(test)]
 mod tests {
 	use super::*;
-	use async_std::sync::{Arc, RwLock};
 
 	type RialtoToMillauMessagesWeights =
 		pallet_bridge_messages::weights::RialtoWeight<rialto_runtime::Runtime>;
@@ -369,12 +418,9 @@ mod tests {
 
 	#[async_std::test]
 	async fn target_to_source_conversion_rate_works() {
-		let metrics = StandaloneMessagesMetrics {
+		assert_eq!(
-			target_to_base_conversion_rate: Some(Arc::new(RwLock::new(Some(183.15)))),
+			StandaloneMessagesMetrics::<relay_rococo_client::Rococo, relay_wococo_client::Wococo>::compute_target_to_source_conversion_rate(Some(183.15), Some(12.32)),
-			source_to_base_conversion_rate: Some(Arc::new(RwLock::new(Some(12.32)))),
+			Some(12.32 / 183.15),
-			target_to_source_conversion_rate: None, // we don't care
+		);
-		};
-
-		assert_eq!(metrics.target_to_source_conversion_rate().await, Some(12.32 / 183.15),);
 	}
 }

bridges/relays/lib-substrate-relay/src/messages_target.rs

@@ -55,7 +55,7 @@ pub struct SubstrateMessagesTarget<P: SubstrateMessageLane> {
 	client: Client<P::TargetChain>,
 	lane: P,
 	lane_id: LaneId,
-	metric_values: StandaloneMessagesMetrics,
+	metric_values: StandaloneMessagesMetrics<P::SourceChain, P::TargetChain>,
 	source_to_target_headers_relay: Option<OnDemandHeadersRelay<P::SourceChain>>,
 }
 
@@ -65,7 +65,7 @@ impl<P: SubstrateMessageLane> SubstrateMessagesTarget<P> {
 		client: Client<P::TargetChain>,
 		lane: P,
 		lane_id: LaneId,
-		metric_values: StandaloneMessagesMetrics,
+		metric_values: StandaloneMessagesMetrics<P::SourceChain, P::TargetChain>,
 		source_to_target_headers_relay: Option<OnDemandHeadersRelay<P::SourceChain>>,
 	) -> Self {
 		SubstrateMessagesTarget {

bridges/relays/messages/src/message_lane_loop.rs

@@ -32,10 +32,7 @@ use futures::{channel::mpsc::unbounded, future::FutureExt, stream::StreamExt};
 use bp_messages::{LaneId, MessageNonce, UnrewardedRelayersState, Weight};
 use bp_runtime::messages::DispatchFeePayment;
 use relay_utils::{
-	interval,
+	interval, metrics::MetricsParams, process_future_result, relay_loop::Client as RelayClient,
-	metrics::{GlobalMetrics, MetricsParams},
-	process_future_result,
-	relay_loop::Client as RelayClient,
 	retry_backoff, FailedClient,
 };
 
@@ -270,9 +267,8 @@ pub async fn run<P: MessageLane, Strategy: RelayStrategy>(
 	let exit_signal = exit_signal.shared();
 	relay_utils::relay_loop(source_client, target_client)
 		.reconnect_delay(params.reconnect_delay)
-		.with_metrics(Some(metrics_prefix::<P>(&params.lane)), metrics_params)
+		.with_metrics(metrics_params)
-		.loop_metric(MessageLaneLoopMetrics::new)?
+		.loop_metric(MessageLaneLoopMetrics::new(Some(&metrics_prefix::<P>(&params.lane)))?)?
-		.standalone_metric(GlobalMetrics::new)?
 		.expose()
 		.await?
 		.run(metrics_prefix::<P>(&params.lane), move |source_client, target_client, metrics| {

bridges/relays/messages/src/metrics.rs

@@ -22,7 +22,9 @@ use crate::{
 };
 
 use bp_messages::MessageNonce;
-use relay_utils::metrics::{metric_name, register, GaugeVec, Opts, PrometheusError, Registry, U64};
+use relay_utils::metrics::{
+	metric_name, register, GaugeVec, Metric, Opts, PrometheusError, Registry, U64,
+};
 
 /// Message lane relay metrics.
 ///
@@ -38,30 +40,22 @@ pub struct MessageLaneLoopMetrics {
 
 impl MessageLaneLoopMetrics {
 	/// Create and register messages loop metrics.
-	pub fn new(registry: &Registry, prefix: Option<&str>) -> Result<Self, PrometheusError> {
+	pub fn new(prefix: Option<&str>) -> Result<Self, PrometheusError> {
 		Ok(MessageLaneLoopMetrics {
-			best_block_numbers: register(
+			best_block_numbers: GaugeVec::new(
-				GaugeVec::new(
+				Opts::new(
-					Opts::new(
+					metric_name(prefix, "best_block_numbers"),
-						metric_name(prefix, "best_block_numbers"),
+					"Best finalized block numbers",
-						"Best finalized block numbers",
+				),
-					),
+				&["type"],
-					&["type"],
-				)?,
-				registry,
 			)?,
-			lane_state_nonces: register(
+			lane_state_nonces: GaugeVec::new(
-				GaugeVec::new(
+				Opts::new(metric_name(prefix, "lane_state_nonces"), "Nonces of the lane state"),
-					Opts::new(metric_name(prefix, "lane_state_nonces"), "Nonces of the lane state"),
+				&["type"],
-					&["type"],
-				)?,
-				registry,
 			)?,
 		})
 	}
-}
 
-impl MessageLaneLoopMetrics {
 	/// Update source client state metrics.
 	pub fn update_source_state<P: MessageLane>(&self, source_client_state: SourceClientState<P>) {
 		self.best_block_numbers
@@ -122,3 +116,11 @@ impl MessageLaneLoopMetrics {
 			.set(target_latest_confirmed_nonce);
 	}
 }
+
+impl Metric for MessageLaneLoopMetrics {
+	fn register(&self, registry: &Registry) -> Result<(), PrometheusError> {
+		register(self.best_block_numbers.clone(), registry)?;
+		register(self.lane_state_nonces.clone(), registry)?;
+		Ok(())
+	}
+}

bridges/relays/utils/src/metrics.rs

@@ -46,28 +46,38 @@ pub struct MetricsParams {
 	/// Interface and TCP port to be used when exposing Prometheus metrics.
 	pub address: Option<MetricsAddress>,
 	/// Metrics registry. May be `Some(_)` if several components share the same endpoint.
-	pub registry: Option<Registry>,
+	pub registry: Registry,
-	/// Prefix that must be used in metric names.
-	pub metrics_prefix: Option<String>,
 }
 
-/// Metrics API.
+/// Metric API.
-pub trait Metrics: Clone + Send + Sync + 'static {}
+pub trait Metric: Clone + Send + Sync + 'static {
+	fn register(&self, registry: &Registry) -> Result<(), PrometheusError>;
+}
 
-impl<T: Clone + Send + Sync + 'static> Metrics for T {}
+/// Standalone metric API.
-
-/// Standalone metrics API.
 ///
 /// Metrics of this kind know how to update themselves, so we may just spawn and forget the
 /// asynchronous self-update task.
 #[async_trait]
-pub trait StandaloneMetrics: Metrics {
+pub trait StandaloneMetric: Metric {
 	/// Update metric values.
 	async fn update(&self);
 
 	/// Metrics update interval.
 	fn update_interval(&self) -> Duration;
 
+	/// Register and spawn metric. Metric is only spawned if it is registered for the first time.
+	fn register_and_spawn(self, registry: &Registry) -> Result<(), PrometheusError> {
+		match self.register(registry) {
+			Ok(()) => {
+				self.spawn();
+				Ok(())
+			},
+			Err(PrometheusError::AlreadyReg) => Ok(()),
+			Err(e) => Err(e),
+		}
+	}
+
 	/// Spawn the self update task that will keep update metric value at given intervals.
 	fn spawn(self) {
 		async_std::task::spawn(async move {
@@ -89,7 +99,7 @@ impl Default for MetricsAddress {
 impl MetricsParams {
 	/// Creates metrics params so that metrics are not exposed.
 	pub fn disabled() -> Self {
-		MetricsParams { address: None, registry: None, metrics_prefix: None }
+		MetricsParams { address: None, registry: Registry::new() }
 	}
 
 	/// Do not expose metrics.
@@ -97,17 +107,11 @@ impl MetricsParams {
 		self.address = None;
 		self
 	}
-
-	/// Set prefix to use in metric names.
-	pub fn metrics_prefix(mut self, prefix: String) -> Self {
-		self.metrics_prefix = Some(prefix);
-		self
-	}
 }
 
 impl From<Option<MetricsAddress>> for MetricsParams {
 	fn from(address: Option<MetricsAddress>) -> Self {
-		MetricsParams { address, registry: None, metrics_prefix: None }
+		MetricsParams { address, registry: Registry::new() }
 	}
 }
 

bridges/relays/utils/src/metrics/float_json_value.rs

@@ -17,8 +17,8 @@
 use crate::{
 	error::{self, Error},
 	metrics::{
-		metric_name, register, F64SharedRef, Gauge, PrometheusError, Registry, StandaloneMetrics,
+		metric_name, register, F64SharedRef, Gauge, Metric, PrometheusError, Registry,
-		F64,
+		StandaloneMetric, F64,
 	},
 };
 
@@ -44,8 +44,6 @@ pub struct FloatJsonValueMetric {
 impl FloatJsonValueMetric {
 	/// Create new metric instance with given name and help.
 	pub fn new(
-		registry: &Registry,
-		prefix: Option<&str>,
 		url: String,
 		json_path: String,
 		name: String,
@@ -55,7 +53,7 @@ impl FloatJsonValueMetric {
 		Ok(FloatJsonValueMetric {
 			url,
 			json_path,
-			metric: register(Gauge::new(metric_name(prefix, &name), help)?, registry)?,
+			metric: Gauge::new(metric_name(None, &name), help)?,
 			shared_value_ref,
 		})
 	}
@@ -81,8 +79,14 @@ impl FloatJsonValueMetric {
 	}
 }
 
+impl Metric for FloatJsonValueMetric {
+	fn register(&self, registry: &Registry) -> Result<(), PrometheusError> {
+		register(self.metric.clone(), registry).map(drop)
+	}
+}
+
 #[async_trait]
-impl StandaloneMetrics for FloatJsonValueMetric {
+impl StandaloneMetric for FloatJsonValueMetric {
 	fn update_interval(&self) -> Duration {
 		UPDATE_INTERVAL
 	}

bridges/relays/utils/src/metrics/global.rs

@@ -17,8 +17,8 @@
 //! Global system-wide Prometheus metrics exposed by relays.
 
 use crate::metrics::{
-	metric_name, register, Gauge, GaugeVec, Opts, PrometheusError, Registry, StandaloneMetrics,
+	metric_name, register, Gauge, GaugeVec, Metric, Opts, PrometheusError, Registry,
-	F64, U64,
+	StandaloneMetric, F64, U64,
 };
 
 use async_std::sync::{Arc, Mutex};
@@ -40,36 +40,36 @@ pub struct GlobalMetrics {
 
 impl GlobalMetrics {
 	/// Create and register global metrics.
-	pub fn new(registry: &Registry, prefix: Option<&str>) -> Result<Self, PrometheusError> {
+	pub fn new() -> Result<Self, PrometheusError> {
 		Ok(GlobalMetrics {
 			system: Arc::new(Mutex::new(System::new_with_specifics(RefreshKind::everything()))),
-			system_average_load: register(
+			system_average_load: GaugeVec::new(
-				GaugeVec::new(
+				Opts::new(metric_name(None, "system_average_load"), "System load average"),
-					Opts::new(metric_name(prefix, "system_average_load"), "System load average"),
+				&["over"],
-					&["over"],
-				)?,
-				registry,
 			)?,
-			process_cpu_usage_percentage: register(
+			process_cpu_usage_percentage: Gauge::new(
-				Gauge::new(
+				metric_name(None, "process_cpu_usage_percentage"),
-					metric_name(prefix, "process_cpu_usage_percentage"),
+				"Process CPU usage",
-					"Process CPU usage",
-				)?,
-				registry,
 			)?,
-			process_memory_usage_bytes: register(
+			process_memory_usage_bytes: Gauge::new(
-				Gauge::new(
+				metric_name(None, "process_memory_usage_bytes"),
-					metric_name(prefix, "process_memory_usage_bytes"),
+				"Process memory (resident set size) usage",
-					"Process memory (resident set size) usage",
-				)?,
-				registry,
 			)?,
 		})
 	}
 }
 
+impl Metric for GlobalMetrics {
+	fn register(&self, registry: &Registry) -> Result<(), PrometheusError> {
+		register(self.system_average_load.clone(), registry)?;
+		register(self.process_cpu_usage_percentage.clone(), registry)?;
+		register(self.process_memory_usage_bytes.clone(), registry)?;
+		Ok(())
+	}
+}
+
 #[async_trait]
-impl StandaloneMetrics for GlobalMetrics {
+impl StandaloneMetric for GlobalMetrics {
 	async fn update(&self) {
 		// update system-wide metrics
 		let mut system = self.system.lock().await;

bridges/relays/utils/src/relay_loop.rs

@@ -16,7 +16,7 @@
 
 use crate::{
 	error::Error,
-	metrics::{Metrics, MetricsAddress, MetricsParams, PrometheusError, StandaloneMetrics},
+	metrics::{Metric, MetricsAddress, MetricsParams},
 	FailedClient, MaybeConnectionError,
 };
 
@@ -53,7 +53,7 @@ pub fn relay_loop<SC, TC>(source_client: SC, target_client: TC) -> Loop<SC, TC,
 
 /// Returns generic relay loop metrics that may be customized and used in one or several relay
 /// loops.
-pub fn relay_metrics(prefix: Option<String>, params: MetricsParams) -> LoopMetrics<(), (), ()> {
+pub fn relay_metrics(params: MetricsParams) -> LoopMetrics<(), (), ()> {
 	LoopMetrics {
 		relay_loop: Loop {
 			reconnect_delay: RECONNECT_DELAY,
@@ -62,8 +62,7 @@ pub fn relay_metrics(prefix: Option<String>, params: MetricsParams) -> LoopMetri
 			loop_metric: None,
 		},
 		address: params.address,
-		registry: params.registry.unwrap_or_else(|| create_metrics_registry(prefix)),
+		registry: params.registry,
-		metrics_prefix: params.metrics_prefix,
 		loop_metric: None,
 	}
 }
@@ -81,7 +80,6 @@ pub struct LoopMetrics<SC, TC, LM> {
 	relay_loop: Loop<SC, TC, ()>,
 	address: Option<MetricsAddress>,
 	registry: Registry,
-	metrics_prefix: Option<String>,
 	loop_metric: Option<LM>,
 }
 
@@ -93,11 +91,7 @@ impl<SC, TC, LM> Loop<SC, TC, LM> {
 	}
 
 	/// Start building loop metrics using given prefix.
-	pub fn with_metrics(
+	pub fn with_metrics(self, params: MetricsParams) -> LoopMetrics<SC, TC, ()> {
-		self,
-		prefix: Option<String>,
-		params: MetricsParams,
-	) -> LoopMetrics<SC, TC, ()> {
 		LoopMetrics {
 			relay_loop: Loop {
 				reconnect_delay: self.reconnect_delay,
@@ -106,8 +100,7 @@ impl<SC, TC, LM> Loop<SC, TC, LM> {
 				loop_metric: None,
 			},
 			address: params.address,
-			registry: params.registry.unwrap_or_else(|| create_metrics_registry(prefix)),
+			registry: params.registry,
-			metrics_prefix: params.metrics_prefix,
 			loop_metric: None,
 		}
 	}
@@ -160,44 +153,23 @@ impl<SC, TC, LM> LoopMetrics<SC, TC, LM> {
 	/// Add relay loop metrics.
 	///
 	/// Loop metrics will be passed to the loop callback.
-	pub fn loop_metric<NewLM: Metrics>(
+	pub fn loop_metric<NewLM: Metric>(
 		self,
-		create_metric: impl FnOnce(&Registry, Option<&str>) -> Result<NewLM, PrometheusError>,
+		metric: NewLM,
 	) -> Result<LoopMetrics<SC, TC, NewLM>, Error> {
-		let loop_metric = create_metric(&self.registry, self.metrics_prefix.as_deref())?;
+		metric.register(&self.registry)?;
 
 		Ok(LoopMetrics {
 			relay_loop: self.relay_loop,
 			address: self.address,
 			registry: self.registry,
-			metrics_prefix: self.metrics_prefix,
+			loop_metric: Some(metric),
-			loop_metric: Some(loop_metric),
 		})
 	}
 
-	/// Add standalone metrics.
-	pub fn standalone_metric<M: StandaloneMetrics>(
-		self,
-		create_metric: impl FnOnce(&Registry, Option<&str>) -> Result<M, PrometheusError>,
-	) -> Result<Self, Error> {
-		// since standalone metrics are updating themselves, we may just ignore the fact that the
-		// same standalone metric is exposed by several loops && only spawn single metric
-		match create_metric(&self.registry, self.metrics_prefix.as_deref()) {
-			Ok(standalone_metrics) => standalone_metrics.spawn(),
-			Err(PrometheusError::AlreadyReg) => (),
-			Err(e) => return Err(e.into()),
-		}
-
-		Ok(self)
-	}
-
 	/// Convert into `MetricsParams` structure so that metrics registry may be extended later.
 	pub fn into_params(self) -> MetricsParams {
-		MetricsParams {
+		MetricsParams { address: self.address, registry: self.registry }
-			address: self.address,
-			registry: Some(self.registry),
-			metrics_prefix: self.metrics_prefix,
-		}
 	}
 
 	/// Expose metrics using address passed at creation.
@@ -274,15 +246,3 @@ pub async fn reconnect_failed_client(
 		break
 	}
 }
-
-/// Create new registry with global metrics.
-fn create_metrics_registry(prefix: Option<String>) -> Registry {
-	match prefix {
-		Some(prefix) => {
-			assert!(!prefix.is_empty(), "Metrics prefix can not be empty");
-			Registry::new_custom(Some(prefix), None)
-				.expect("only fails if prefix is empty; prefix is not empty; qed")
-		},
-		None => Registry::new(),
-	}
-}