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/availability-distribution/src/lib.rs

@@ -385,6 +385,8 @@ async fn handle_our_view_change<Context>(
 where
 	Context: SubsystemContext<Message = AvailabilityDistributionMessage>,
 {
+	let _timer = metrics.time_handle_our_view_change();
+
 	let old_view = std::mem::replace(&mut (state.view), view);
 
 	// needed due to borrow rules
@@ -651,6 +653,8 @@ async fn process_incoming_peer_message<Context>(
 where
 	Context: SubsystemContext<Message = AvailabilityDistributionMessage>,
 {
+	let _timer = metrics.time_process_incoming_peer_message();
+
 	// obtain the set of candidates we are interested in based on our current view
 	let live_candidates = state.cached_live_candidates_unioned(state.view.0.iter());
 
@@ -1180,6 +1184,8 @@ where
 #[derive(Clone)]
 struct MetricsInner {
 	gossipped_availability_chunks: prometheus::Counter<prometheus::U64>,
+	handle_our_view_change: prometheus::Histogram,
+	process_incoming_peer_message: prometheus::Histogram,
 }
 
 /// Availability Distribution metrics.
@@ -1192,6 +1198,16 @@ impl Metrics {
 			metrics.gossipped_availability_chunks.inc();
 		}
 	}
+
+	/// Provide a timer for `handle_our_view_change` which observes on drop.
+	fn time_handle_our_view_change(&self) -> Option<metrics::prometheus::prometheus::HistogramTimer> {
+		self.0.as_ref().map(|metrics| metrics.handle_our_view_change.start_timer())
+	}
+
+	/// Provide a timer for `process_incoming_peer_message` which observes on drop.
+	fn time_process_incoming_peer_message(&self) -> Option<metrics::prometheus::prometheus::HistogramTimer> {
+		self.0.as_ref().map(|metrics| metrics.process_incoming_peer_message.start_timer())
+	}
 }
 
 impl metrics::Metrics for Metrics {
@@ -1206,6 +1222,24 @@ impl metrics::Metrics for Metrics {
 				)?,
 				registry,
 			)?,
+			handle_our_view_change: prometheus::register(
+				prometheus::Histogram::with_opts(
+					prometheus::HistogramOpts::new(
+						"parachain_availability_distribution_handle_our_view_change",
+						"Time spent within `availability_distribution::handle_our_view_change`",
+					)
+				)?,
+				registry,
+			)?,
+			process_incoming_peer_message: prometheus::register(
+				prometheus::Histogram::with_opts(
+					prometheus::HistogramOpts::new(
+						"parachain_availability_distribution_process_incoming_peer_message",
+						"Time spent within `availability_distribution::process_incoming_peer_message`",
+					)
+				)?,
+				registry,
+			)?,
 		};
 		Ok(Metrics(Some(metrics)))
 	}