Golang metric.NewGauge函數代碼示例

// newRemoteClockMonitor returns a monitor with the given server clock.
func newRemoteClockMonitor(clock *hlc.Clock, offsetTTL time.Duration) *RemoteClockMonitor {
	r := RemoteClockMonitor{
		clock:     clock,
		offsetTTL: offsetTTL,
	}
	r.mu.offsets = make(map[string]RemoteOffset)
	r.metrics = RemoteClockMetrics{
		ClockOffsetMeanNanos:   metric.NewGauge(metaClockOffsetMeanNanos),
		ClockOffsetStdDevNanos: metric.NewGauge(metaClockOffsetStdDevNanos),
	}
	return &r
}

func TestNodeSetFilter(t *testing.T) {
	defer leaktest.AfterTest(t)()
	nodes1 := makeNodeSet(2, metric.NewGauge(metric.Metadata{Name: ""}))
	node0 := roachpb.NodeID(1)
	node1 := roachpb.NodeID(2)
	nodes1.addNode(node0)
	nodes1.addNode(node1)

	nodes2 := makeNodeSet(1, metric.NewGauge(metric.Metadata{Name: ""}))
	nodes2.addNode(node1)

	filtered := nodes1.filter(func(a roachpb.NodeID) bool {
		return !nodes2.hasNode(a)
	})
	if filtered.len() != 1 || filtered.hasNode(node1) || !filtered.hasNode(node0) {
		t.Errorf("expected filter to leave node0: %+v", filtered)
	}
}

// filter returns an nodeSet of nodes which return true when passed to the
// supplied filter function filterFn. filterFn should return true to keep an
// node and false to remove an node. The new nodeSet has a separate gauge object
// from the parent.
func (as nodeSet) filter(filterFn func(node roachpb.NodeID) bool) nodeSet {
	avail := makeNodeSet(as.maxSize,
		metric.NewGauge(metric.Metadata{Name: "TODO(marc)", Help: "TODO(marc)"}))
	for node := range as.nodes {
		if filterFn(node) {
			avail.addNode(node)
		}
	}
	return avail
}

func TestNodeSetMaxSize(t *testing.T) {
	defer leaktest.AfterTest(t)()
	nodes := makeNodeSet(1, metric.NewGauge(metric.Metadata{Name: ""}))
	if !nodes.hasSpace() {
		t.Error("set should have space")
	}
	nodes.addNode(roachpb.NodeID(1))
	if nodes.hasSpace() {
		t.Error("set should have no space")
	}
}

func TestNodeSetHasNode(t *testing.T) {
	defer leaktest.AfterTest(t)()
	nodes := makeNodeSet(2, metric.NewGauge(metric.Metadata{Name: ""}))
	node := roachpb.NodeID(1)
	if nodes.hasNode(node) {
		t.Error("node wasn't added and should not be valid")
	}
	// Add node and verify it's valid.
	nodes.addNode(node)
	if !nodes.hasNode(node) {
		t.Error("empty node wasn't added and should not be valid")
	}
}

func TestNodeSetAsSlice(t *testing.T) {
	defer leaktest.AfterTest(t)()
	nodes := makeNodeSet(2, metric.NewGauge(metric.Metadata{Name: ""}))
	node0 := roachpb.NodeID(1)
	node1 := roachpb.NodeID(2)
	nodes.addNode(node0)
	nodes.addNode(node1)

	nodeArr := nodes.asSlice()
	if len(nodeArr) != 2 {
		t.Error("expected slice of length 2:", nodeArr)
	}
	if (nodeArr[0] != node0 && nodeArr[0] != node1) ||
		(nodeArr[1] != node1 && nodeArr[1] != node0) {
		t.Error("expected slice to contain both node0 and node1:", nodeArr)
	}
}

func TestNodeSetAddAndRemoveNode(t *testing.T) {
	defer leaktest.AfterTest(t)()
	nodes := makeNodeSet(2, metric.NewGauge(metric.Metadata{Name: ""}))
	node0 := roachpb.NodeID(1)
	node1 := roachpb.NodeID(2)
	nodes.addNode(node0)
	nodes.addNode(node1)
	if !nodes.hasNode(node0) || !nodes.hasNode(node1) {
		t.Error("failed to locate added nodes")
	}
	nodes.removeNode(node0)
	if nodes.hasNode(node0) || !nodes.hasNode(node1) {
		t.Error("failed to remove node0", nodes)
	}
	nodes.removeNode(node1)
	if nodes.hasNode(node0) || nodes.hasNode(node1) {
		t.Error("failed to remove node1", nodes)
	}
}

//.........這裏部分代碼省略.........
		// Generate time series data.
		tsPrefix := "cr.node."
		if !isNode {
			tsPrefix = "cr.store."
		}
		expect := tspb.TimeSeriesData{
			Name:   tsPrefix + prefix + name,
			Source: strconv.FormatInt(source, 10),
			Datapoints: []tspb.TimeSeriesDatapoint{
				{
					TimestampNanos: time,
					Value:          float64(val),
				},
			},
		}
		expected = append(expected, expect)

		// Generate status summary data.
		if isNode {
			expectedNodeSummaryMetrics[prefix+name] = float64(val)
		} else {
			// This can overwrite the previous value, but this is expected as
			// all stores in our tests have identical values; when comparing
			// status summaries, the same map is used as expected data for all
			// stores.
			expectedStoreSummaryMetrics[prefix+name] = float64(val)
		}
	}

	for _, reg := range regList {
		for _, data := range metricNames {
			switch data.typ {
			case "gauge":
				g := metric.NewGauge(metric.Metadata{Name: reg.prefix + data.name})
				reg.reg.AddMetric(g)
				g.Update(data.val)
				addExpected(reg.prefix, data.name, reg.source, 100, data.val, reg.isNode)
			case "floatgauge":
				g := metric.NewGaugeFloat64(metric.Metadata{Name: reg.prefix + data.name})
				reg.reg.AddMetric(g)
				g.Update(float64(data.val))
				addExpected(reg.prefix, data.name, reg.source, 100, data.val, reg.isNode)
			case "counter":
				c := metric.NewCounter(metric.Metadata{Name: reg.prefix + data.name})
				reg.reg.AddMetric(c)
				c.Inc((data.val))
				addExpected(reg.prefix, data.name, reg.source, 100, data.val, reg.isNode)
			case "counterwithrates":
				r := metric.NewCounterWithRates(metric.Metadata{Name: reg.prefix + data.name})
				reg.reg.AddMetric(r)
				r.Inc(data.val)
				addExpected(reg.prefix, data.name, reg.source, 100, data.val, reg.isNode)
			case "histogram":
				h := metric.NewHistogram(metric.Metadata{Name: reg.prefix + data.name}, time.Second, 1000, 2)
				reg.reg.AddMetric(h)
				h.RecordValue(data.val)
				for _, q := range recordHistogramQuantiles {
					addExpected(reg.prefix, data.name+q.suffix, reg.source, 100, data.val, reg.isNode)
				}
			case "latency":
				l := metric.NewLatency(metric.Metadata{Name: reg.prefix + data.name}, time.Hour)
				reg.reg.AddMetric(l)
				l.RecordValue(data.val)
				// Latency is simply three histograms (at different resolution
				// time scales).
				for _, q := range recordHistogramQuantiles {

func newStoreMetrics(sampleInterval time.Duration) *StoreMetrics {
	storeRegistry := metric.NewRegistry()
	sm := &StoreMetrics{
		registry: storeRegistry,

		// Replica metrics.
		ReplicaCount:                  metric.NewCounter(metaReplicaCount),
		ReservedReplicaCount:          metric.NewCounter(metaReservedReplicaCount),
		RaftLeaderCount:               metric.NewGauge(metaRaftLeaderCount),
		RaftLeaderNotLeaseHolderCount: metric.NewGauge(metaRaftLeaderNotLeaseHolderCount),
		LeaseHolderCount:              metric.NewGauge(metaLeaseHolderCount),
		QuiescentCount:                metric.NewGauge(metaQuiescentCount),

		// Replica CommandQueue metrics.
		MaxCommandQueueSize:       metric.NewGauge(metaMaxCommandQueueSize),
		MaxCommandQueueWriteCount: metric.NewGauge(metaMaxCommandQueueWriteCount),
		MaxCommandQueueReadCount:  metric.NewGauge(metaMaxCommandQueueReadCount),
		MaxCommandQueueTreeSize:   metric.NewGauge(metaMaxCommandQueueTreeSize),
		MaxCommandQueueOverlaps:   metric.NewGauge(metaMaxCommandQueueOverlaps),
		CombinedCommandQueueSize:  metric.NewGauge(metaCombinedCommandQueueSize),
		CombinedCommandWriteCount: metric.NewGauge(metaCombinedCommandWriteCount),
		CombinedCommandReadCount:  metric.NewGauge(metaCombinedCommandReadCount),

		// Range metrics.
		RangeCount:                metric.NewGauge(metaRangeCount),
		UnavailableRangeCount:     metric.NewGauge(metaUnavailableRangeCount),
		UnderReplicatedRangeCount: metric.NewGauge(metaUnderReplicatedRangeCount),

		// Lease request metrics.
		LeaseRequestSuccessCount: metric.NewCounter(metaLeaseRequestSuccessCount),
		LeaseRequestErrorCount:   metric.NewCounter(metaLeaseRequestErrorCount),

		// Storage metrics.
		LiveBytes:       metric.NewGauge(metaLiveBytes),
		KeyBytes:        metric.NewGauge(metaKeyBytes),
		ValBytes:        metric.NewGauge(metaValBytes),
		IntentBytes:     metric.NewGauge(metaIntentBytes),
		LiveCount:       metric.NewGauge(metaLiveCount),
		KeyCount:        metric.NewGauge(metaKeyCount),
		ValCount:        metric.NewGauge(metaValCount),
		IntentCount:     metric.NewGauge(metaIntentCount),
		IntentAge:       metric.NewGauge(metaIntentAge),
		GcBytesAge:      metric.NewGauge(metaGcBytesAge),
		LastUpdateNanos: metric.NewGauge(metaLastUpdateNanos),
		Capacity:        metric.NewGauge(metaCapacity),
		Available:       metric.NewGauge(metaAvailable),
		Reserved:        metric.NewCounter(metaReserved),
		SysBytes:        metric.NewGauge(metaSysBytes),
		SysCount:        metric.NewGauge(metaSysCount),

		// RocksDB metrics.
		RdbBlockCacheHits:           metric.NewGauge(metaRdbBlockCacheHits),
		RdbBlockCacheMisses:         metric.NewGauge(metaRdbBlockCacheMisses),
		RdbBlockCacheUsage:          metric.NewGauge(metaRdbBlockCacheUsage),
		RdbBlockCachePinnedUsage:    metric.NewGauge(metaRdbBlockCachePinnedUsage),
		RdbBloomFilterPrefixChecked: metric.NewGauge(metaRdbBloomFilterPrefixChecked),
		RdbBloomFilterPrefixUseful:  metric.NewGauge(metaRdbBloomFilterPrefixUseful),
		RdbMemtableHits:             metric.NewGauge(metaRdbMemtableHits),
		RdbMemtableMisses:           metric.NewGauge(metaRdbMemtableMisses),
		RdbMemtableTotalSize:        metric.NewGauge(metaRdbMemtableTotalSize),
		RdbFlushes:                  metric.NewGauge(metaRdbFlushes),
		RdbCompactions:              metric.NewGauge(metaRdbCompactions),
		RdbTableReadersMemEstimate:  metric.NewGauge(metaRdbTableReadersMemEstimate),
		RdbReadAmplification:        metric.NewGauge(metaRdbReadAmplification),
		RdbNumSSTables:              metric.NewGauge(metaRdbNumSSTables),

		// Range event metrics.
		RangeSplits:                     metric.NewCounter(metaRangeSplits),
		RangeAdds:                       metric.NewCounter(metaRangeAdds),
		RangeRemoves:                    metric.NewCounter(metaRangeRemoves),
		RangeSnapshotsGenerated:         metric.NewCounter(metaRangeSnapshotsGenerated),
		RangeSnapshotsNormalApplied:     metric.NewCounter(metaRangeSnapshotsNormalApplied),
		RangeSnapshotsPreemptiveApplied: metric.NewCounter(metaRangeSnapshotsPreemptiveApplied),

		// Raft processing metrics.
		RaftTicks:                metric.NewCounter(metaRaftTicks),
		RaftWorkingDurationNanos: metric.NewCounter(metaRaftWorkingDurationNanos),
		RaftTickingDurationNanos: metric.NewCounter(metaRaftTickingDurationNanos),

		// Raft message metrics.
		RaftRcvdMsgProp:           metric.NewCounter(metaRaftRcvdProp),
		RaftRcvdMsgApp:            metric.NewCounter(metaRaftRcvdApp),
		RaftRcvdMsgAppResp:        metric.NewCounter(metaRaftRcvdAppResp),
		RaftRcvdMsgVote:           metric.NewCounter(metaRaftRcvdVote),
		RaftRcvdMsgVoteResp:       metric.NewCounter(metaRaftRcvdVoteResp),
		RaftRcvdMsgPreVote:        metric.NewCounter(metaRaftRcvdPreVote),
		RaftRcvdMsgPreVoteResp:    metric.NewCounter(metaRaftRcvdPreVoteResp),
		RaftRcvdMsgSnap:           metric.NewCounter(metaRaftRcvdSnap),
		RaftRcvdMsgHeartbeat:      metric.NewCounter(metaRaftRcvdHeartbeat),
		RaftRcvdMsgHeartbeatResp:  metric.NewCounter(metaRaftRcvdHeartbeatResp),
		RaftRcvdMsgTransferLeader: metric.NewCounter(metaRaftRcvdTransferLeader),
		RaftRcvdMsgTimeoutNow:     metric.NewCounter(metaRaftRcvdTimeoutNow),
		RaftRcvdMsgDropped:        metric.NewCounter(metaRaftRcvdDropped),
		raftRcvdMessages:          make(map[raftpb.MessageType]*metric.Counter, len(raftpb.MessageType_name)),

		RaftEnqueuedPending: metric.NewGauge(metaRaftEnqueuedPending),

		// This Gauge measures the number of heartbeats queued up just before
		// the queue is cleared, to avoid flapping wildly.
		RaftCoalescedHeartbeatsPending: metric.NewGauge(metaRaftCoalescedHeartbeatsPending),
//.........這裏部分代碼省略.........

// MakeRuntimeStatSampler constructs a new RuntimeStatSampler object.
func MakeRuntimeStatSampler(clock *hlc.Clock) RuntimeStatSampler {
	// Construct the build info metric. It is constant.
	// We first build set the labels on the metadata.
	info := build.GetInfo()
	timestamp, err := info.Timestamp()
	if err != nil {
		// We can't panic here, tests don't have a build timestamp.
		log.Warningf(context.TODO(), "Could not parse build timestamp: %v", err)
	}

	metaBuildTimestamp.AddLabel("tag", info.Tag)
	metaBuildTimestamp.AddLabel("go_version", info.GoVersion)

	buildTimestamp := metric.NewGauge(metaBuildTimestamp)
	buildTimestamp.Update(timestamp)

	return RuntimeStatSampler{
		clock:          clock,
		startTimeNanos: clock.PhysicalNow(),
		CgoCalls:       metric.NewGauge(metaCgoCalls),
		Goroutines:     metric.NewGauge(metaGoroutines),
		GoAllocBytes:   metric.NewGauge(metaGoAllocBytes),
		GoTotalBytes:   metric.NewGauge(metaGoTotalBytes),
		CgoAllocBytes:  metric.NewGauge(metaCgoAllocBytes),
		CgoTotalBytes:  metric.NewGauge(metaCgoTotalBytes),
		GcCount:        metric.NewGauge(metaGCCount),
		GcPauseNS:      metric.NewGauge(metaGCPauseNS),
		GcPausePercent: metric.NewGaugeFloat64(metaGCPausePercent),
		CPUUserNS:      metric.NewGauge(metaCPUUserNS),
		CPUUserPercent: metric.NewGaugeFloat64(metaCPUUserPercent),
		CPUSysNS:       metric.NewGauge(metaCPUSysNS),
		CPUSysPercent:  metric.NewGaugeFloat64(metaCPUSysPercent),
		Rss:            metric.NewGauge(metaRSS),
		FDOpen:         metric.NewGauge(metaFDOpen),
		FDSoftLimit:    metric.NewGauge(metaFDSoftLimit),
		Uptime:         metric.NewGauge(metaUptime),
		BuildTimestamp: buildTimestamp,
	}
}