timer,ttl: add some metrics for timer framework and TTL timer syncing

metrics/BUILD.bazel

@@ -27,6 +27,7 @@ go_library(
     visibility = ["//visibility:public"],
     deps = [
         "//parser/terror",
+        "//timer/metrics",
         "//util/logutil",
         "//util/mathutil",
         "@com_github_pingcap_errors//:errors",

metrics/metrics.go

@@ -17,6 +17,7 @@ package metrics
 import (
 	"sync"
 
+	timermetrics "github.com/pingcap/tidb/timer/metrics"
 	"github.com/pingcap/tidb/util/logutil"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/collectors"
@@ -91,6 +92,7 @@ func InitMetrics() {
 	InitTelemetryMetrics()
 	InitTopSQLMetrics()
 	InitTTLMetrics()
+	timermetrics.InitTimerMetrics()
 
 	PanicCounter = NewCounterVec(
 		prometheus.CounterOpts{
@@ -255,6 +257,9 @@ func RegisterMetrics() {
 	prometheus.MustRegister(TTLPhaseTime)
 	prometheus.MustRegister(TTLInsertRowsCount)
 	prometheus.MustRegister(TTLWatermarkDelay)
+	prometheus.MustRegister(TTLEventCounter)
+
+	prometheus.MustRegister(timermetrics.TimerEventCounter)
 
 	prometheus.MustRegister(EMACPUUsageGauge)
 	prometheus.MustRegister(PoolConcurrencyCounter)

metrics/ttl.go

@@ -31,6 +31,12 @@ var (
 	TTLInsertRowsCount prometheus.Counter
 
 	TTLWatermarkDelay *prometheus.GaugeVec
+
+	TTLEventCounter *prometheus.CounterVec
+
+	TTLSyncTimerCounter prometheus.Counter
+
+	TTLFullRefreshTimersCounter prometheus.Counter
 )
 
 // InitTTLMetrics initializes ttl metrics.
@@ -91,4 +97,15 @@ func InitTTLMetrics() {
 			Name:      "ttl_watermark_delay",
 			Help:      "Bucketed delay time in seconds for TTL tables.",
 		}, []string{LblType, LblName})
+
+	TTLEventCounter = NewCounterVec(
+		prometheus.CounterOpts{
+			Namespace: "tidb",
+			Subsystem: "server",
+			Name:      "ttl_event_count",
+			Help:      "Counter of ttl event.",
+		}, []string{LblType})
+
+	TTLSyncTimerCounter = TTLEventCounter.WithLabelValues("sync_one_timer")
+	TTLFullRefreshTimersCounter = TTLEventCounter.WithLabelValues("full_refresh_timers")
 }

timer/metrics/BUILD.bazel

@@ -0,0 +1,9 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "metrics",
+    srcs = ["metrics.go"],
+    importpath = "github.com/pingcap/tidb/timer/metrics",
+    visibility = ["//visibility:public"],
+    deps = ["@com_github_prometheus_client_golang//prometheus"],
+)

timer/metrics/metrics.go

@@ -0,0 +1,49 @@
+// Copyright 2023 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package metrics
+
+import (
+	"fmt"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// Timer metrics
+var (
+	TimerEventCounter *prometheus.CounterVec
+
+	TimerFullRefreshCounter    prometheus.Counter
+	TimerPartialRefreshCounter prometheus.Counter
+)
+
+// InitTimerMetrics initializes timers metrics.
+func InitTimerMetrics() {
+	TimerEventCounter = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Namespace: "tidb",
+			Subsystem: "server",
+			Name:      "timer_event_count",
+			Help:      "Counter of timer event.",
+		}, []string{"scope", "type"})
+
+	rtScope := "runtime"
+	TimerFullRefreshCounter = TimerEventCounter.WithLabelValues(rtScope, "full_refresh_timers")
+	TimerPartialRefreshCounter = TimerEventCounter.WithLabelValues(rtScope, "partial_refresh_timers")
+}
+
+// TimerHookWorkerCounter creates a counter for a hook's event
+func TimerHookWorkerCounter(hookClass string, event string) prometheus.Counter {
+	return TimerEventCounter.WithLabelValues(fmt.Sprintf("hook.%s", hookClass), event)
+}

timer/runtime/BUILD.bazel

@@ -11,9 +11,11 @@ go_library(
     visibility = ["//visibility:public"],
     deps = [
         "//timer/api",
+        "//timer/metrics",
         "//util/logutil",
         "@com_github_google_uuid//:uuid",
         "@com_github_pingcap_errors//:errors",
+        "@com_github_prometheus_client_golang//prometheus",
         "@org_golang_x_exp//maps",
         "@org_uber_go_zap//:zap",
     ],
@@ -35,6 +37,8 @@ go_test(
     deps = [
         "//testkit/testsetup",
         "//timer/api",
+        "//timer/metrics",
+        "//util/mock",
         "@com_github_google_uuid//:uuid",
         "@com_github_pingcap_errors//:errors",
         "@com_github_stretchr_testify//mock",

timer/runtime/runtime.go

@@ -23,6 +23,7 @@ import (
 
 	"github.com/google/uuid"
 	"github.com/pingcap/tidb/timer/api"
+	"github.com/pingcap/tidb/timer/metrics"
 	"github.com/pingcap/tidb/util/logutil"
 	"go.uber.org/zap"
 	"golang.org/x/exp/maps"
@@ -210,6 +211,7 @@ func (rt *TimerGroupRuntime) loop() {
 }
 
 func (rt *TimerGroupRuntime) fullRefreshTimers() {
+	metrics.TimerFullRefreshCounter.Inc()
 	timers, err := rt.store.List(rt.ctx, rt.cond)
 	if err != nil {
 		rt.logger.Error("error occurs when fullRefreshTimers", zap.Error(err))
@@ -354,6 +356,7 @@ func (rt *TimerGroupRuntime) partialRefreshTimers(timerIDs map[string]struct{})
 		return false
 	}
 
+	metrics.TimerPartialRefreshCounter.Inc()
 	cond := rt.buildTimerIDsCond(timerIDs)
 	timers, err := rt.store.List(rt.ctx, cond)
 	if err != nil {

timer/runtime/runtime_test.go

@@ -24,6 +24,8 @@ import (
 
 	"github.com/pingcap/errors"
 	"github.com/pingcap/tidb/timer/api"
+	"github.com/pingcap/tidb/timer/metrics"
+	mockutil "github.com/pingcap/tidb/util/mock"
 	"github.com/stretchr/testify/mock"
 	"github.com/stretchr/testify/require"
 )
@@ -388,6 +390,14 @@ func TestNextTryTriggerDuration(t *testing.T) {
 }
 
 func TestFullRefreshTimers(t *testing.T) {
+	origFullRefreshCounter := metrics.TimerFullRefreshCounter
+	defer func() {
+		metrics.TimerFullRefreshCounter = origFullRefreshCounter
+	}()
+
+	fullRefreshCounter := &mockutil.MetricsCounter{}
+	metrics.TimerFullRefreshCounter = fullRefreshCounter
+
 	mockCore, mockStore := newMockStore()
 	runtime := NewTimerRuntimeBuilder("g1", mockStore).Build()
 	runtime.cond = &api.TimerCond{Namespace: api.NewOptionalVal("n1")}
@@ -428,11 +438,14 @@ func TestFullRefreshTimers(t *testing.T) {
 	t6New.Version++
 
 	mockCore.On("List", mock.Anything, runtime.cond).Return(timers[0:], errors.New("mockErr")).Once()
+	require.Equal(t, float64(0), fullRefreshCounter.Val())
 	runtime.fullRefreshTimers()
+	require.Equal(t, float64(1), fullRefreshCounter.Val())
 	require.Equal(t, 7, len(runtime.cache.items))
 
 	mockCore.On("List", mock.Anything, runtime.cond).Return([]*api.TimerRecord{t0New, timers[1], t2New, t4New, t6New}, nil).Once()
 	runtime.fullRefreshTimers()
+	require.Equal(t, float64(2), fullRefreshCounter.Val())
 	mockCore.AssertExpectations(t)
 	require.Equal(t, 5, len(runtime.cache.items))
 	require.Equal(t, t0New, runtime.cache.items["t0"].timer)
@@ -446,6 +459,14 @@ func TestFullRefreshTimers(t *testing.T) {
 }
 
 func TestBatchHandlerWatchResponses(t *testing.T) {
+	origPartialRefreshCounter := metrics.TimerPartialRefreshCounter
+	defer func() {
+		metrics.TimerPartialRefreshCounter = origPartialRefreshCounter
+	}()
+
+	partialRefreshCounter := &mockutil.MetricsCounter{}
+	metrics.TimerPartialRefreshCounter = partialRefreshCounter
+
 	mockCore, mockStore := newMockStore()
 	runtime := NewTimerRuntimeBuilder("g1", mockStore).Build()
 	runtime.cond = &api.TimerCond{Namespace: api.NewOptionalVal("n1")}
@@ -509,6 +530,7 @@ func TestBatchHandlerWatchResponses(t *testing.T) {
 			require.Contains(t, condIDs, "t2")
 		})
 
+	require.Equal(t, float64(0), partialRefreshCounter.Val())
 	runtime.batchHandleWatchResponses([]api.WatchTimerResponse{
 		{
 			Events: []*api.WatchTimerEvent{
@@ -535,6 +557,7 @@ func TestBatchHandlerWatchResponses(t *testing.T) {
 			},
 		},
 	})
+	require.Equal(t, float64(1), partialRefreshCounter.Val())
 
 	mockCore.AssertExpectations(t)
 	require.Equal(t, 6, len(runtime.cache.items))

timer/runtime/worker.go

@@ -21,7 +21,9 @@ import (
 
 	"github.com/pingcap/errors"
 	"github.com/pingcap/tidb/timer/api"
+	"github.com/pingcap/tidb/timer/metrics"
 	"github.com/pingcap/tidb/util/logutil"
+	"github.com/prometheus/client_golang/prometheus"
 	"go.uber.org/zap"
 )
 
@@ -68,6 +70,13 @@ type hookWorker struct {
 	ch        chan *triggerEventRequest
 	logger    *zap.Logger
 	nowFunc   func() time.Time
+	// metrics for worker
+	triggerRequestCounter       prometheus.Counter
+	onPreSchedEventCounter      prometheus.Counter
+	onPreSchedEventErrCounter   prometheus.Counter
+	onPreSchedEventDelayCounter prometheus.Counter
+	onSchedEventCounter         prometheus.Counter
+	onSchedEventErrCounter      prometheus.Counter
 }
 
 func newHookWorker(ctx context.Context, wg *sync.WaitGroup, groupID string, hookClass string, hook api.Hook, nowFunc func() time.Time) *hookWorker {
@@ -85,7 +94,13 @@ func newHookWorker(ctx context.Context, wg *sync.WaitGroup, groupID string, hook
 			zap.String("groupID", groupID),
 			zap.String("hookClass", hookClass),
 		),
-		nowFunc: nowFunc,
+		nowFunc:                     nowFunc,
+		triggerRequestCounter:       metrics.TimerHookWorkerCounter(hookClass, "trigger"),
+		onPreSchedEventCounter:      metrics.TimerHookWorkerCounter(hookClass, "OnPreSchedEvent"),
+		onPreSchedEventErrCounter:   metrics.TimerHookWorkerCounter(hookClass, "OnPreSchedEvent_error"),
+		onPreSchedEventDelayCounter: metrics.TimerHookWorkerCounter(hookClass, "OnPreSchedEvent_delay"),
+		onSchedEventCounter:         metrics.TimerHookWorkerCounter(hookClass, "OnSchedEvent"),
+		onSchedEventErrCounter:      metrics.TimerHookWorkerCounter(hookClass, "OnSchedEvent_error"),
 	}
 
 	wg.Add(1)
@@ -127,6 +142,7 @@ func (w *hookWorker) loop() {
 }
 
 func (w *hookWorker) triggerEvent(req *triggerEventRequest, logger *zap.Logger) *triggerEventResponse {
+	w.triggerRequestCounter.Inc()
 	timer := req.timer
 	resp := &triggerEventResponse{
 		timerID: timer.ID,
@@ -177,6 +193,7 @@ func (w *hookWorker) triggerEvent(req *triggerEventRequest, logger *zap.Logger)
 		var preResult api.PreSchedEventResult
 		if w.hook != nil {
 			logger.Debug("call OnPreSchedEvent")
+			w.onPreSchedEventCounter.Inc()
 			result, err := w.hook.OnPreSchedEvent(w.ctx, &timerEvent{
 				eventID: req.eventID,
 				record:  timer,
@@ -188,15 +205,16 @@ func (w *hookWorker) triggerEvent(req *triggerEventRequest, logger *zap.Logger)
 					zap.Error(err),
 					zap.Duration("retryAfter", workerEventDefaultRetryInterval),
 				)
+				w.onPreSchedEventErrCounter.Inc()
 				resp.retryAfter.Set(workerEventDefaultRetryInterval)
 				return resp
 			}
 
 			if result.Delay > 0 {
+				w.onPreSchedEventDelayCounter.Inc()
 				resp.retryAfter.Set(result.Delay)
 				return resp
 			}
-
 			preResult = result
 		}
 
@@ -257,12 +275,14 @@ func (w *hookWorker) triggerEvent(req *triggerEventRequest, logger *zap.Logger)
 
 	if w.hook != nil {
 		logger.Debug("call OnSchedEvent")
+		w.onSchedEventCounter.Inc()
 		err = w.hook.OnSchedEvent(w.ctx, &timerEvent{
 			eventID: req.eventID,
 			record:  timer,
 		})
 
 		if err != nil {
+			w.onSchedEventErrCounter.Inc()
 			logger.Error(
 				"error occurs when invoking hook OnTimerEvent",
 				zap.Error(err),