tracing: connection manager

* removed unused namespace "ImpossibleConnection"
* set severity of `ConnectionManagerCounters` to `Info` (as in the
  legacy tracing system)

Author: coot

cardano-node/src/Cardano/Node/Tracing/Tracers/P2P.hs

@@ -1489,19 +1489,18 @@ instance MetaTrace (ConnectionManager.Trace addr
           TrHandshakeServerError {} -> Info
           TrConnectionHandlerError _ _ ShutdownNode  -> Critical
           TrConnectionHandlerError _ _ ShutdownPeer  -> Info
-    severityFor (Namespace _  ["ConnectionHandler"]) _ = Just Info
+    severityFor (Namespace _  ["ConnectionHandler"]) Nothing = Just Info
     severityFor (Namespace _  ["Shutdown"]) _ = Just Info
     severityFor (Namespace _  ["ConnectionExists"]) _ = Just Info
     severityFor (Namespace _  ["ForbiddenConnection"]) _ = Just Info
-    severityFor (Namespace _  ["ImpossibleConnection"]) _ = Just Info
     severityFor (Namespace _  ["ConnectionFailure"]) _ = Just Info
     severityFor (Namespace _  ["ConnectionNotFound"]) _ = Just Debug
     severityFor (Namespace _  ["ForbiddenOperation"]) _ = Just Info
     severityFor (Namespace _  ["PruneConnections"]) _ = Just Notice
     severityFor (Namespace _  ["ConnectionCleanup"]) _ = Just Debug
     severityFor (Namespace _  ["ConnectionTimeWait"]) _ = Just Debug
     severityFor (Namespace _  ["ConnectionTimeWaitDone"]) _ = Just Info
-    severityFor (Namespace _  ["ConnectionManagerCounters"]) _ = Just Debug
+    severityFor (Namespace _  ["ConnectionManagerCounters"]) _ = Just Info
     severityFor (Namespace _  ["State"]) _ = Just Info
     severityFor (Namespace _  ["UnexpectedlyFalseAssertion"]) _ = Just Error
     severityFor _ _ = Nothing
@@ -1516,7 +1515,6 @@ instance MetaTrace (ConnectionManager.Trace addr
     documentFor (Namespace _  ["Shutdown"]) = Just ""
     documentFor (Namespace _  ["ConnectionExists"]) = Just ""
     documentFor (Namespace _  ["ForbiddenConnection"]) = Just ""
-    documentFor (Namespace _  ["ImpossibleConnection"]) = Just ""
     documentFor (Namespace _  ["ConnectionFailure"]) = Just ""
     documentFor (Namespace _  ["ConnectionNotFound"]) = Just ""
     documentFor (Namespace _  ["ForbiddenOperation"]) = Just ""
@@ -1550,7 +1548,6 @@ instance MetaTrace (ConnectionManager.Trace addr
       , Namespace [] ["Shutdown"]
       , Namespace [] ["ConnectionExists"]
       , Namespace [] ["ForbiddenConnection"]
-      , Namespace [] ["ImpossibleConnection"]
       , Namespace [] ["ConnectionFailure"]
       , Namespace [] ["ConnectionNotFound"]
       , Namespace [] ["ForbiddenOperation"]