metrics: move Subsystem to constants

pkg/file/metrics.go

@@ -6,28 +6,26 @@ import (
 	"github.com/prometheus/client_golang/prometheus/promauto"
 )
 
+const promSubsystem = "file"
+
 var (
 	promFileInitialSeekSkipped = promauto.NewGaugeVec(prometheus.GaugeOpts{
-		Namespace: globals.PrometheusPrefix,
-		// Subsystem: "file",
+		Namespace: globals.PrometheusPrefix, // Subsystem: promSubsystem,
 		Name:      "skipped_bytes",
 		Help:      "Bytes skipped in file after discovering",
 	}, []string{"filename"})
 	promFileCatchupDone = promauto.NewGaugeVec(prometheus.GaugeOpts{
-		Namespace: globals.PrometheusPrefix,
-		Subsystem: "file",
+		Namespace: globals.PrometheusPrefix, Subsystem: promSubsystem,
 		Name: "catchupped",
 		Help: "(0 or) 1 if initial backlog has been sent; (total <= watcher_file_count)",
 	}, []string{"filename"})
 	promFileErr = promauto.NewCounterVec(prometheus.CounterOpts{
-		Namespace: globals.PrometheusPrefix,
-		Subsystem: "file",
+		Namespace: globals.PrometheusPrefix, Subsystem: promSubsystem,
 		Name: "errors_count",
 		Help: "Errors while reading file",
 	}, []string{"filename"})
 	promFileLineSize = promauto.NewHistogramVec(prometheus.HistogramOpts{
-		Namespace: globals.PrometheusPrefix,
-		// Subsystem: "file",
+		Namespace: globals.PrometheusPrefix, Subsystem: promSubsystem,
 		Name:    "line_size_bytes",
 		Help:    "Log line size in bytes",
 		Buckets: []float64{80, 160, 320, 640, 1280},

pkg/lines/metrics.go

@@ -6,17 +6,17 @@ import (
 	"github.com/prometheus/client_golang/prometheus/promauto"
 )
 
+const promSubsystem = "record"
+
 var (
 	promRecordDroppedTooLarge = promauto.NewCounterVec(prom.CounterOpts{
-		Namespace: globals.PrometheusPrefix,
-		// Subsystem: "record",
+		Namespace: globals.PrometheusPrefix, // Subsystem: promSubsystem,
 		Name:      "dropped_lines",          // "dropped",
 		Help:      "Records dropped due to being too large",
 	}, []string{"filename"})
 
 	promRecordPrefixParsingErr = promauto.NewCounterVec(prom.CounterOpts{
-		Namespace: globals.PrometheusPrefix,
-		Subsystem: "record",
+		Namespace: globals.PrometheusPrefix, Subsystem: promSubsystem,
 		Name: "parsing_errors",
 		Help: "Errors while parsing log line prefixes",
 	}, []string{"filename"})

pkg/sender/metrics.go

@@ -6,35 +6,32 @@ import (
 	"github.com/prometheus/client_golang/prometheus/promauto"
 )
 
+const promSubsystem = "shipper"
+
 var (
 	promShipperQueued = promauto.NewGaugeVec(prometheus.GaugeOpts{
-		Namespace: globals.PrometheusPrefix,
-		// Subsystem: "shipper",
+		Namespace: globals.PrometheusPrefix, // Subsystem: promSubsystem,
 		Name:      "shipper_record",         // "queued",
 		Help:      "Log records in queue to be batched and sent to database",
 	}, []string{"filename"})
 	promShipperDbSent = promauto.NewCounterVec(prometheus.CounterOpts{
-		Namespace: globals.PrometheusPrefix,
-		// Subsystem: "shipper",
+		Namespace: globals.PrometheusPrefix, // Subsystem: promSubsystem,
 		Name:      "record",                 // "sent",
 		Help:      "Log records successfully committed to database",
 	}, []string{"filename"})
 	promShipperBatchSizeResult = promauto.NewHistogram(prometheus.HistogramOpts{
-		Namespace: globals.PrometheusPrefix,
-		// Subsystem: "shipper",
+		Namespace: globals.PrometheusPrefix,  // Subsystem: promSubsystem,
 		Name:      "bulk_submission_message", // "items_in_batch"
 		Help:      "Batch size for database submissions",
 		Buckets:   []float64{1, 5, 10, 50, 100, 500, 1000, 5000, 10000},
 	})
 	promShipperDbSendError = promauto.NewCounterVec(prometheus.CounterOpts{
-		Namespace: globals.PrometheusPrefix,
-		// Subsystem: "shipper",
+		Namespace: globals.PrometheusPrefix, // Subsystem: promSubsystem,
 		Name:      "insertion_error",        // "errors",
 		Help:      "Failed database bulk insertions",
 	}, []string{"filename"})
 	promShipperSynced = promauto.NewGaugeVec(prometheus.GaugeOpts{
-		Namespace: globals.PrometheusPrefix,
-		Subsystem: "shipper",
+		Namespace: globals.PrometheusPrefix, Subsystem: promSubsystem,
 		Name: "batches_synced",
 		Help: "All batches available have been committed database (0 or 1)",
 	}, []string{"filename"})

pkg/watcher/metrics.go

@@ -6,34 +6,31 @@ import (
 	"github.com/prometheus/client_golang/prometheus/promauto"
 )
 
+const promSubsystem = "watcher"
+
 var (
 	promWatcherOnline = promauto.NewGauge(prom.GaugeOpts{
-		Namespace: globals.PrometheusPrefix,
-		Subsystem: "watcher",
+		Namespace: globals.PrometheusPrefix, Subsystem: promSubsystem,
 		Name: "online",
 		Help: "1 if initialized, and directory watcher has been engaged successfully",
 	})
 	promWatcherErr = promauto.NewCounter(prom.CounterOpts{
-		Namespace: globals.PrometheusPrefix,
-		Subsystem: "watcher",
+		Namespace: globals.PrometheusPrefix, Subsystem: promSubsystem,
 		Name: "errors",
 		Help: "Error in logmower watching log files",
 	})
 	promWatcherFilesStarted = promauto.NewCounter(prom.CounterOpts{
-		Namespace: globals.PrometheusPrefix,
-		// Subsystem: "watcher",
+		Namespace: globals.PrometheusPrefix, // Subsystem: promSubsystem,
 		Name:      "log_file",               // "discovered_logfiles",
 		Help:      "Number of tracked log files",
 	})
 	promWatcherFilesSkipped = promauto.NewCounter(prom.CounterOpts{
-		Namespace: globals.PrometheusPrefix,
-		// Subsystem: "watcher",
+		Namespace: globals.PrometheusPrefix, // Subsystem: promSubsystem,
 		Name:      "invalid_filename",       // "skipped_files",
 		Help:      "Number of files in log directory skipped due to unexpected filename",
 	})
 	promWatcherEvents = promauto.NewCounter(prom.CounterOpts{
-		Namespace: globals.PrometheusPrefix,
-		// Subsystem: "watcher",
+		Namespace: globals.PrometheusPrefix, // Subsystem: promSubsystem,
 		Name:      "inotify_event",          // "events",
 		Help:      "Number of events while watchng (includes initial create events for existing file discovery)",
 	})