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// Copyright 2015 The etcd Authors
//
// 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 etcdserver
import (
goruntime "runtime"
"time"
"go.etcd.io/etcd/pkg/runtime"
"go.etcd.io/etcd/version"
"github.com/prometheus/client_golang/prometheus"
"go.uber.org/zap"
)
var (
hasLeader = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "has_leader",
Help: "Whether or not a leader exists. 1 is existence, 0 is not.",
})
isLeader = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "is_leader",
Help: "Whether or not this member is a leader. 1 if is, 0 otherwise.",
})
leaderChanges = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "leader_changes_seen_total",
Help: "The number of leader changes seen.",
})
isLearner = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "is_learner",
Help: "Whether or not this member is a learner. 1 if is, 0 otherwise.",
})
learnerPromoteFailed = prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "learner_promote_failures",
Help: "The total number of failed learner promotions (likely learner not ready) while this member is leader.",
},
[]string{"Reason"},
)
learnerPromoteSucceed = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "learner_promote_successes",
Help: "The total number of successful learner promotions while this member is leader.",
})
heartbeatSendFailures = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "heartbeat_send_failures_total",
Help: "The total number of leader heartbeat send failures (likely overloaded from slow disk).",
})
slowApplies = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "slow_apply_total",
Help: "The total number of slow apply requests (likely overloaded from slow disk).",
})
applySnapshotInProgress = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "snapshot_apply_in_progress_total",
Help: "1 if the server is applying the incoming snapshot. 0 if none.",
})
proposalsCommitted = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "proposals_committed_total",
Help: "The total number of consensus proposals committed.",
})
proposalsApplied = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "proposals_applied_total",
Help: "The total number of consensus proposals applied.",
})
proposalsPending = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "proposals_pending",
Help: "The current number of pending proposals to commit.",
})
proposalsFailed = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "proposals_failed_total",
Help: "The total number of failed proposals seen.",
})
slowReadIndex = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "slow_read_indexes_total",
Help: "The total number of pending read indexes not in sync with leader's or timed out read index requests.",
})
readIndexFailed = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "read_indexes_failed_total",
Help: "The total number of failed read indexes seen.",
})
leaseExpired = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: "etcd_debugging",
Subsystem: "server",
Name: "lease_expired_total",
Help: "The total number of expired leases.",
})
quotaBackendBytes = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "quota_backend_bytes",
Help: "Current backend storage quota size in bytes.",
})
currentVersion = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "version",
Help: "Which version is running. 1 for 'server_version' label with current version.",
},
[]string{"server_version"})
currentGoVersion = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "go_version",
Help: "Which Go version server is running with. 1 for 'server_go_version' label with current version.",
},
[]string{"server_go_version"})
serverID = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: "etcd",
Subsystem: "server",
Name: "id",
Help: "Server or member ID in hexadecimal format. 1 for 'server_id' label with current ID.",
},
[]string{"server_id"})
)
func init() {
prometheus.MustRegister(hasLeader)
prometheus.MustRegister(isLeader)
prometheus.MustRegister(leaderChanges)
prometheus.MustRegister(heartbeatSendFailures)
prometheus.MustRegister(slowApplies)
prometheus.MustRegister(applySnapshotInProgress)
prometheus.MustRegister(proposalsCommitted)
prometheus.MustRegister(proposalsApplied)
prometheus.MustRegister(proposalsPending)
prometheus.MustRegister(proposalsFailed)
prometheus.MustRegister(slowReadIndex)
prometheus.MustRegister(readIndexFailed)
prometheus.MustRegister(leaseExpired)
prometheus.MustRegister(quotaBackendBytes)
prometheus.MustRegister(currentVersion)
prometheus.MustRegister(currentGoVersion)
prometheus.MustRegister(serverID)
prometheus.MustRegister(isLearner)
prometheus.MustRegister(learnerPromoteSucceed)
prometheus.MustRegister(learnerPromoteFailed)
currentVersion.With(prometheus.Labels{
"server_version": version.Version,
}).Set(1)
currentGoVersion.With(prometheus.Labels{
"server_go_version": goruntime.Version(),
}).Set(1)
}
func monitorFileDescriptor(lg *zap.Logger, done <-chan struct{}) {
ticker := time.NewTicker(5 * time.Second)
defer ticker.Stop()
for {
used, err := runtime.FDUsage()
if err != nil {
if lg != nil {
lg.Warn("failed to get file descriptor usage", zap.Error(err))
} else {
plog.Errorf("cannot monitor file descriptor usage (%v)", err)
}
return
}
limit, err := runtime.FDLimit()
if err != nil {
if lg != nil {
lg.Warn("failed to get file descriptor limit", zap.Error(err))
} else {
plog.Errorf("cannot monitor file descriptor usage (%v)", err)
}
return
}
if used >= limit/5*4 {
if lg != nil {
lg.Warn("80% of file descriptors are used", zap.Uint64("used", used), zap.Uint64("limit", limit))
} else {
plog.Warningf("80%% of the file descriptor limit is used [used = %d, limit = %d]", used, limit)
}
}
select {
case <-ticker.C:
case <-done:
return
}
}
}