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/core/provisioner/src/lib.rs

@@ -197,6 +197,8 @@ impl ProvisioningJob {
 
 			match msg {
 				ToJob::Provisioner(RequestInherentData(_, return_sender)) => {
+					let _timer = self.metrics.time_request_inherent_data();
+
 					if let Err(err) = send_inherent_data(
 						self.relay_parent,
 						&self.signed_bitfields,
@@ -216,6 +218,8 @@ impl ProvisioningJob {
 					self.provisionable_data_channels.push(sender)
 				}
 				ToJob::Provisioner(ProvisionableData(_, data)) => {
+					let _timer = self.metrics.time_provisionable_data();
+
 					let mut bad_indices = Vec::new();
 					for (idx, channel) in self.provisionable_data_channels.iter_mut().enumerate() {
 						match channel.send(data.clone()).await {
@@ -488,6 +492,8 @@ fn bitfields_indicate_availability(
 #[derive(Clone)]
 struct MetricsInner {
 	inherent_data_requests: prometheus::CounterVec<prometheus::U64>,
+	request_inherent_data: prometheus::Histogram,
+	provisionable_data: prometheus::Histogram,
 }
 
 /// Provisioner metrics.
@@ -503,6 +509,16 @@ impl Metrics {
 			}
 		}
 	}
+
+	/// Provide a timer for `request_inherent_data` which observes on drop.
+	fn time_request_inherent_data(&self) -> Option<metrics::prometheus::prometheus::HistogramTimer> {
+		self.0.as_ref().map(|metrics| metrics.request_inherent_data.start_timer())
+	}
+
+	/// Provide a timer for `provisionable_data` which observes on drop.
+	fn time_provisionable_data(&self) -> Option<metrics::prometheus::prometheus::HistogramTimer> {
+		self.0.as_ref().map(|metrics| metrics.provisionable_data.start_timer())
+	}
 }
 
 impl metrics::Metrics for Metrics {
@@ -518,6 +534,24 @@ impl metrics::Metrics for Metrics {
 				)?,
 				registry,
 			)?,
+			request_inherent_data: prometheus::register(
+				prometheus::Histogram::with_opts(
+					prometheus::HistogramOpts::new(
+						"parachain_provisioner_request_inherent_data",
+						"Time spent within `provisioner::request_inherent_data`",
+					)
+				)?,
+				registry,
+			)?,
+			provisionable_data: prometheus::register(
+				prometheus::Histogram::with_opts(
+					prometheus::HistogramOpts::new(
+						"parachain_provisioner_provisionable_data",
+						"Time spent within `provisioner::provisionable_data`",
+					)
+				)?,
+				registry,
+			)?,
 		};
 		Ok(Metrics(Some(metrics)))
 	}