p2p: log 'Send failed' on Debug (#2857)

CHANGELOG_PENDING.md

@@ -26,11 +26,14 @@ program](https://hackerone.com/tendermint).
 
 
 ### FEATURES:
-- [log] new `log_format` config option, which can be set to 'plain' for colored
+
+- [log] \#2843 New `log_format` config option, which can be set to 'plain' for colored
   text or 'json' for JSON output
 
 - [types] \#2767 New event types EventDataNewRound (with ProposerInfo) and EventDataCompleteProposal (with BlockID). (@kevlubkcm)
 
 ### IMPROVEMENTS:
 
+- [p2p] \#2857 "Send failed" is logged at debug level instead of error.
+
 ### BUG FIXES:

p2p/conn/connection.go

@@ -269,7 +269,7 @@ func (c *MConnection) Send(chID byte, msgBytes []byte) bool {
 		default:
 		}
 	} else {
-		c.Logger.Error("Send failed", "channel", chID, "conn", c, "msgBytes", fmt.Sprintf("%X", msgBytes))
+		c.Logger.Debug("Send failed", "channel", chID, "conn", c, "msgBytes", fmt.Sprintf("%X", msgBytes))
 	}
 	return success
 }