Added consensus-client.chain-id metric (#59)

Author: phearnot

build.sbt

@@ -19,7 +19,8 @@ inScope(Global)(
       "-unchecked",
       "-language:higherKinds",
       "-language:implicitConversions",
-      "-language:postfixOps"
+      "-language:postfixOps",
+      "-language:experimental.namedTuples"
     )
   )
 )

src/main/scala/units/ELUpdater.scala

@@ -22,6 +22,7 @@ import com.wavesplatform.utx.UtxPool
 import com.wavesplatform.wallet.Wallet
 import io.netty.channel.Channel
 import io.netty.channel.group.DefaultChannelGroup
+import kamon.Kamon
 import monix.execution.cancelables.SerialCancelable
 import monix.execution.{CancelableFuture, Scheduler}
 import play.api.libs.json.*
@@ -1735,6 +1736,18 @@ class ELUpdater(
 
   private def setState(label: String, newState: State): Unit = {
     logger.trace(s"New state after $label: $newState")
+    val chainIdOpt = newState match {
+      case Working(chainStatus = cs) =>
+        cs match {
+          case FollowingChain(nodeChainInfo = ChainInfo(id = id)) => Some(id)
+          case Mining(nodeChainInfo = Right(nci))                 => Some(nci.id)
+          case _                                                  => None
+        }
+      case _ => None
+    }
+
+    chainIdOpt.foreach(chainId => Kamon.gauge("consensus-client.chain-id").withTag("chain-contract", config.chainContract).update(chainId.toDouble))
+
     state = newState
   }
 }