move implementation to internal/ directory (#828)

internal/zfs/prometheus.go

@@ -0,0 +1,66 @@
+package zfs
+
+import "github.com/prometheus/client_golang/prometheus"
+
+var prom struct {
+	ZFSListFilesystemVersionDuration          *prometheus.HistogramVec
+	ZFSSnapshotDuration                       *prometheus.HistogramVec
+	ZFSBookmarkDuration                       *prometheus.HistogramVec
+	ZFSDestroyDuration                        *prometheus.HistogramVec
+	ZFSListUnmatchedUserSpecifiedDatasetCount *prometheus.GaugeVec
+}
+
+func init() {
+	prom.ZFSListFilesystemVersionDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
+		Namespace: "zrepl",
+		Subsystem: "zfs",
+		Name:      "list_filesystem_versions_duration",
+		Help:      "Seconds it took for listing the versions of a given filesystem",
+	}, []string{"filesystem"})
+	prom.ZFSSnapshotDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
+		Namespace: "zrepl",
+		Subsystem: "zfs",
+		Name:      "snapshot_duration",
+		Help:      "Seconds it took to create a snapshot a given filesystem",
+	}, []string{"filesystem"})
+	prom.ZFSBookmarkDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
+		Namespace: "zrepl",
+		Subsystem: "zfs",
+		Name:      "bookmark_duration",
+		Help:      "Duration it took to bookmark a given snapshot",
+	}, []string{"filesystem"})
+	prom.ZFSDestroyDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
+		Namespace: "zrepl",
+		Subsystem: "zfs",
+		Name:      "destroy_duration",
+		Help:      "Duration it took to destroy a dataset",
+	}, []string{"dataset_type", "filesystem"})
+	prom.ZFSListUnmatchedUserSpecifiedDatasetCount = prometheus.NewGaugeVec(prometheus.GaugeOpts{
+		Namespace: "zrepl",
+		Subsystem: "zfs",
+		Name:      "list_unmatched_user_specified_dataset_count",
+		Help: "When evaluating a DatsetFilter against zfs list output, this counter " +
+			"is incremented for every DatasetFilter rule that did not match any " +
+			"filesystem name in the zfs list output. Monitor for increases to detect filesystem " +
+			"filter rules that have no effect because they don't match any local filesystem.",
+	}, []string{"jobid"})
+}
+
+func PrometheusRegister(registry prometheus.Registerer) error {
+	if err := registry.Register(prom.ZFSListFilesystemVersionDuration); err != nil {
+		return err
+	}
+	if err := registry.Register(prom.ZFSBookmarkDuration); err != nil {
+		return err
+	}
+	if err := registry.Register(prom.ZFSSnapshotDuration); err != nil {
+		return err
+	}
+	if err := registry.Register(prom.ZFSDestroyDuration); err != nil {
+		return err
+	}
+	if err := registry.Register(prom.ZFSListUnmatchedUserSpecifiedDatasetCount); err != nil {
+		return err
+	}
+	return nil
+}