initial jaeger integration (#2047)

Co-authored-by: Pierre Krieger <pierre.krieger1708@gmail.com>
Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

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

@@ -23,6 +23,7 @@
 #![warn(missing_docs)]
 
 use polkadot_subsystem::{
+	jaeger,
 	Subsystem, SubsystemResult, SubsystemContext, SpawnedSubsystem,
 	ActiveLeavesUpdate, FromOverseer, OverseerSignal,
 	messages::{
@@ -828,6 +829,7 @@ async fn handle_network_update(
 					).await;
 
 					if let Some((relay_parent, new)) = new_stored {
+						let mut _span = jaeger::hash_span(&relay_parent, "sending-statement");
 						// When we receive a new message from a peer, we forward it to the
 						// candidate backing subsystem.
 						let message = AllMessages::CandidateBacking(
@@ -943,6 +945,7 @@ impl StatementDistribution {
 				FromOverseer::Communication { msg } => match msg {
 					StatementDistributionMessage::Share(relay_parent, statement) => {
 						let _timer = metrics.time_share();
+						let mut _span = jaeger::hash_span(&relay_parent, "circulate-statement");
 
 						inform_statement_listeners(
 							&statement,