consul: Provide output for serfHealth check. Fixes #176.

consul/leader.go

@@ -13,6 +13,8 @@ import (
 const (
 	SerfCheckID           = "serfHealth"
 	SerfCheckName         = "Serf Health Status"
+	SerfCheckAliveOutput  = "Agent alive and reachable"
+	SerfCheckFailedOutput = "Agent not live or unreachable"
 	ConsulServiceID       = "consul"
 	ConsulServiceName     = "consul"
 	newLeaderEvent        = "consul:new-leader"
@@ -266,6 +268,7 @@ AFTER_CHECK:
 			CheckID: SerfCheckID,
 			Name:    SerfCheckName,
 			Status:  structs.HealthPassing,
+			Output:  SerfCheckAliveOutput,
 		},
 	}
 	var out struct{}
@@ -300,6 +303,7 @@ func (s *Server) handleFailedMember(member serf.Member) error {
 			CheckID: SerfCheckID,
 			Name:    SerfCheckName,
 			Status:  structs.HealthCritical,
+			Output:  SerfCheckFailedOutput,
 		},
 	}
 	var out struct{}