improve logging

- log merged head stop
- add network name to label
- log only non-empty deltas of grpc upstreams changes

src/main/kotlin/io/emeraldpay/dshackle/upstream/DynamicMergedHead.kt

@@ -34,6 +34,7 @@ open class DynamicMergedHead(
 
     override fun stop() {
         super.stop()
+        log.info("Stop dynamic merged head for [$label]")
         dynamicFlux.stop()
         subscription?.dispose()
         subscription = null

src/main/kotlin/io/emeraldpay/dshackle/upstream/ethereum/EthereumMultistream.kt

@@ -48,7 +48,7 @@ open class EthereumMultistream(
 
     private var head: DynamicMergedHead = DynamicMergedHead(
         PriorityForkChoice(),
-        "ETH Multistream",
+        "ETH Multistream of ${chain.chainCode}",
         headScheduler
     )
 

src/main/kotlin/io/emeraldpay/dshackle/upstream/ethereum_pos/EthereumPosMultiStream.kt

@@ -47,7 +47,7 @@ open class EthereumPosMultiStream(
 
     private var head: DynamicMergedHead = DynamicMergedHead(
         PriorityForkChoice(),
-        "ETH Pos Multistream",
+        "ETH Pos Multistream of ${chain.chainCode}",
         headScheduler
     )
 

src/main/kotlin/io/emeraldpay/dshackle/upstream/grpc/GrpcUpstreams.kt

@@ -155,7 +155,9 @@ class GrpcUpstreams(
         }.map {
             UpstreamChangeEvent(it.key, known.remove(it.key)!!, UpstreamChangeEvent.ChangeType.REMOVED)
         }
-        log.info("Finished processing of grpc upstream description for $id with content delta added [${added.map { it.chain }}] and removed [${removed.map { it.chain }}]")
+        if (removed.isNotEmpty() || added.isNotEmpty()) {
+            log.info("Finished processing of grpc upstream description for $id with content delta added ${added.map { it.chain }} and removed ${removed.map { it.chain }}")
+        }
         return Flux.fromIterable(removed + added)
     }