Handle logs from all pods in function and error condition in fission fn log command (#2634)

* handle error condition in fission fn log command
* use single stream for log exclude fetcher logs
* add all-pods in fn logs command
* update previous stable version

pkg/fission-cli/flag/flag.go

@@ -130,6 +130,7 @@ var (
 	FnRequestsPerPod        = Flag{Type: Int, Name: flagkey.FnRequestsPerPod, Aliases: []string{"rpp"}, Usage: "Maximum number of concurrent requests that can be served by a specialized pod", DefaultValue: 1}
 	FnOnceOnly              = Flag{Type: Bool, Name: flagkey.FnOnceOnly, Aliases: []string{"yolo"}, Usage: "Specifies if specialized pod will serve exactly one request in its lifetime"}
 	FnSubPath               = Flag{Type: String, Name: flagkey.FnSubPath, Usage: "Sub Path to check if function internally supports routing"}
+	FnLogAllPods            = Flag{Type: Bool, Name: flagkey.FnLogAllPods, Usage: "Get all pod's logs in the function."}
 	// Termination Grace Period configurable at function creation/update only for container functions
 	FnTerminationGracePeriod = Flag{Type: Int64, Name: flagkey.FnGracePeriod, Usage: "Grace time (in seconds) for pod to perform connection draining before termination (default value will be used if negative value is given)", DefaultValue: 360}
 

pkg/fission-cli/flag/key/key.go

@@ -84,6 +84,7 @@ const (
 	FnOnceOnly              = "onceonly"
 	FnSubPath               = "subpath"
 	FnGracePeriod           = "graceperiod"
+	FnLogAllPods            = "all-pods"
 
 	HtName              = resourceName
 	HtMethod            = "method"