Add Prometheus timers to the subsystems (#1923)

* reexport prometheus-super for ease of use of other subsystems

* add some prometheus timers for collation generation subsystem

* add timing metrics to av-store

* add metrics to candidate backing

* add timing metric to bitfield signing

* add timing metrics to candidate selection

* add timing metrics to candidate-validation

* add timing metrics to chain-api

* add timing metrics to provisioner

* add timing metrics to runtime-api

* add timing metrics to availability-distribution

* add timing metrics to bitfield-distribution

* add timing metrics to collator protocol: collator side

* add timing metrics to collator protocol: validator side

* fix candidate validation test failures

* add timing metrics to pov distribution

* add timing metrics to statement-distribution

* use substrate_prometheus_endpoint prometheus reexport instead of prometheus_super

* don't include JOB_DELAY in bitfield-signing metrics

* give adder-collator ability to easily export its genesis-state and validation code

* wip: adder-collator pushbutton script

* don't attempt to register the adder-collator automatically

Instead, get these values with

```sh
target/release/adder-collator export-genesis-state
target/release/adder-collator export-genesis-wasm
```

And then register the parachain on https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A9944#/explorer

To collect prometheus data, after running the script, create `prometheus.yml` per the instructions
at https://www.notion.so/paritytechnologies/Setting-up-Prometheus-locally-835cb3a9df7541a781c381006252b5ff
and then run:

```sh
docker run -v `pwd`/prometheus.yml:/etc/prometheus/prometheus.yml:z --network host prom/prometheus
```

Demonstrates that data makes it across to prometheus, though it is likely to be useful in the future
to tweak the buckets.

* Update parachain/test-parachains/adder/collator/src/cli.rs

Co-authored-by: Andronik Ordian <write@reusable.software>

* use the grandpa-pause parameter

* skip metrics in tracing instrumentation

* remove unnecessary grandpa_pause cli param

Co-authored-by: Andronik Ordian <write@reusable.software>

polkadot/node/network/pov-distribution/src/lib.rs

@@ -125,6 +125,8 @@ async fn handle_signal(
 	match signal {
 		OverseerSignal::Conclude => Ok(true),
 		OverseerSignal::ActiveLeaves(ActiveLeavesUpdate { activated, deactivated }) => {
+			let _timer = state.metrics.time_handle_signal();
+
 			for relay_parent in activated {
 				let (vals_tx, vals_rx) = oneshot::channel();
 				ctx.send_message(AllMessages::RuntimeApi(RuntimeApiMessage::Request(
@@ -267,6 +269,8 @@ async fn handle_fetch(
 	descriptor: CandidateDescriptor,
 	response_sender: oneshot::Sender<Arc<PoV>>,
 ) -> SubsystemResult<()> {
+	let _timer = state.metrics.time_handle_fetch();
+
 	let relay_parent_state = match state.relay_parent_state.get_mut(&relay_parent) {
 		Some(s) => s,
 		None => return Ok(()),
@@ -316,6 +320,8 @@ async fn handle_distribute(
 	descriptor: CandidateDescriptor,
 	pov: Arc<PoV>,
 ) -> SubsystemResult<()> {
+	let _timer = state.metrics.time_handle_distribute();
+
 	let relay_parent_state = match state.relay_parent_state.get_mut(&relay_parent) {
 		None => return Ok(()),
 		Some(s) => s,
@@ -483,6 +489,8 @@ async fn handle_network_update(
 	ctx: &mut impl SubsystemContext<Message = PoVDistributionMessage>,
 	update: NetworkBridgeEvent<protocol_v1::PoVDistributionMessage>,
 ) -> SubsystemResult<()> {
+	let _timer = state.metrics.time_handle_network_update();
+
 	match update {
 		NetworkBridgeEvent::PeerConnected(peer, _observed_role) => {
 			state.peer_state.insert(peer, PeerState { awaited: HashMap::new() });
@@ -600,6 +608,10 @@ impl PoVDistribution {
 #[derive(Clone)]
 struct MetricsInner {
 	povs_distributed: prometheus::Counter<prometheus::U64>,
+	handle_signal: prometheus::Histogram,
+	handle_fetch: prometheus::Histogram,
+	handle_distribute: prometheus::Histogram,
+	handle_network_update: prometheus::Histogram,
 }
 
 /// Availability Distribution metrics.
@@ -612,6 +624,26 @@ impl Metrics {
 			metrics.povs_distributed.inc();
 		}
 	}
+
+	/// Provide a timer for `handle_signal` which observes on drop.
+	fn time_handle_signal(&self) -> Option<metrics::prometheus::prometheus::HistogramTimer> {
+		self.0.as_ref().map(|metrics| metrics.handle_signal.start_timer())
+	}
+
+	/// Provide a timer for `handle_fetch` which observes on drop.
+	fn time_handle_fetch(&self) -> Option<metrics::prometheus::prometheus::HistogramTimer> {
+		self.0.as_ref().map(|metrics| metrics.handle_fetch.start_timer())
+	}
+
+	/// Provide a timer for `handle_distribute` which observes on drop.
+	fn time_handle_distribute(&self) -> Option<metrics::prometheus::prometheus::HistogramTimer> {
+		self.0.as_ref().map(|metrics| metrics.handle_distribute.start_timer())
+	}
+
+	/// Provide a timer for `handle_network_update` which observes on drop.
+	fn time_handle_network_update(&self) -> Option<metrics::prometheus::prometheus::HistogramTimer> {
+		self.0.as_ref().map(|metrics| metrics.handle_network_update.start_timer())
+	}
 }
 
 impl metrics::Metrics for Metrics {
@@ -624,6 +656,42 @@ impl metrics::Metrics for Metrics {
 				)?,
 				registry,
 			)?,
+			handle_signal: prometheus::register(
+				prometheus::Histogram::with_opts(
+					prometheus::HistogramOpts::new(
+						"parachain_pov_distribution_handle_signal",
+						"Time spent within `pov_distribution::handle_signal`",
+					)
+				)?,
+				registry,
+			)?,
+			handle_fetch: prometheus::register(
+				prometheus::Histogram::with_opts(
+					prometheus::HistogramOpts::new(
+						"parachain_pov_distribution_handle_fetch",
+						"Time spent within `pov_distribution::handle_fetch`",
+					)
+				)?,
+				registry,
+			)?,
+			handle_distribute: prometheus::register(
+				prometheus::Histogram::with_opts(
+					prometheus::HistogramOpts::new(
+						"parachain_pov_distribution_handle_distribute",
+						"Time spent within `pov_distribution::handle_distribute`",
+					)
+				)?,
+				registry,
+			)?,
+			handle_network_update: prometheus::register(
+				prometheus::Histogram::with_opts(
+					prometheus::HistogramOpts::new(
+						"parachain_pov_distribution_handle_network_update",
+						"Time spent within `pov_distribution::handle_network_update`",
+					)
+				)?,
+				registry,
+			)?,
 		};
 		Ok(Metrics(Some(metrics)))
 	}