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etcdserver: add is_leader prometheus metric that is 1 on the leader.

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Before this change, we had now way to find a leader using /metrics
endpoint. This commit adds a metric to do that.
This commit is contained in:
Maciej Borsz 2018-04-19 11:42:40 +02:00
parent e5c9483cd8
commit 46bc966aa7
2 changed files with 12 additions and 0 deletions
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7
etcdserver/metrics.go
View File

@ -30,6 +30,12 @@ var (
Name: "has_leader", Name: "has_leader",
Help: "Whether or not a leader exists. 1 is existence, 0 is not.", 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{ leaderChanges = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: "etcd", Namespace: "etcd",
Subsystem: "server", Subsystem: "server",
@ -77,6 +83,7 @@ var (
func init() { func init() {
prometheus.MustRegister(hasLeader) prometheus.MustRegister(hasLeader)
prometheus.MustRegister(isLeader)
prometheus.MustRegister(leaderChanges) prometheus.MustRegister(leaderChanges)
prometheus.MustRegister(proposalsCommitted) prometheus.MustRegister(proposalsCommitted)
prometheus.MustRegister(proposalsApplied) prometheus.MustRegister(proposalsApplied)

5
etcdserver/raft.go
View File

@ -182,6 +182,11 @@ func (r *raftNode) start(rh *raftReadyHandler) {
rh.updateLead(rd.SoftState.Lead) rh.updateLead(rd.SoftState.Lead)
islead = rd.RaftState == raft.StateLeader islead = rd.RaftState == raft.StateLeader
if islead {
isLeader.Set(1)
} else {
isLeader.Set(0)
}
rh.updateLeadership(newLeader) rh.updateLeadership(newLeader)
r.td.Reset() r.td.Reset()
} }