watching_dir is not required

plugin/input/file/README.md

@@ -35,13 +35,13 @@ pipelines:
 ```
 
 ### Config params
-**`watching_dir`** *`string`* *`required`* 
+**`watching_dir`** *`string`* 
 
 List of included pathes
-*`string`* *`required`* 
+*`string`* 
 
 List of excluded pathes
-*`string`* *`required`* 
+*`string`* 
 
 The source directory to watch for files to process. All subdirectories also will be watched. E.g. if files have
 `/var/my-logs/$YEAR/$MONTH/$DAY/$HOST/$FACILITY-$PROGRAM.log` structure, `watching_dir` should be `/var/my-logs`.

plugin/input/file/file.go

@@ -105,7 +105,7 @@ type Config struct {
 	// > `/var/my-logs/$YEAR/$MONTH/$DAY/$HOST/$FACILITY-$PROGRAM.log` structure, `watching_dir` should be `/var/my-logs`.
 	// > Also the `filename_pattern`/`dir_pattern` is useful to filter needless files/subdirectories. In the case of using two or more
 	// > different directories, it's recommended to setup separate pipelines for each.
-	WatchingDir string `json:"watching_dir" required:"true"` // *
+	WatchingDir string `json:"watching_dir"` // *
 
 	// > @3@4@5@6
 	// >

plugin/input/file/provider_test.go

@@ -86,6 +86,7 @@ func TestProvierWatcherPaths(t *testing.T) {
 				ctl.RegisterCounter("worker1", "help_test"),
 				ctl.RegisterCounter("worker2", "help_test"),
 				ctl.RegisterGauge("worker3", "help_test"),
+				ctl.RegisterGauge("worker4", "help_test"),
 			)
 			jp := NewJobProvider(config, metrics, &zap.SugaredLogger{})