cmd/ursrv: Add metrics for incoming reports

cmd/ursrv/serve/metrics.go

@@ -0,0 +1,26 @@
+// Copyright (C) 2023 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package serve
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+)
+
+var metricReportsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
+	Namespace: "syncthing",
+	Subsystem: "ursrv",
+	Name:      "reports_total",
+}, []string{"version"})
+
+func init() {
+	metricReportsTotal.WithLabelValues("fail")
+	metricReportsTotal.WithLabelValues("duplicate")
+	metricReportsTotal.WithLabelValues("v1")
+	metricReportsTotal.WithLabelValues("v2")
+	metricReportsTotal.WithLabelValues("v3")
+}