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Monitoring

etcd monitoring dashboards, metrics, and alert rules.

Dashboards

ETCD module provides one monitoring dashboard: Etcd Overview.

ETCD Overview Dashboard

ETCD Overview: Overview of ETCD cluster

Dashboard provides key ETCD status info. Notable: ETCD Aliveness—shows overall etcd cluster service status.

Red bands = instance downtime; blue-gray below = cluster unavailable.

etcd-overview.jpg

Alert Rules

Pigsty provides five preset alert rules for etcd, defined in files/victoria/rules/etcd.yml:

  • EtcdServerDown: etcd node down, CRIT alert
  • EtcdNoLeader: etcd cluster no leader, CRIT alert
  • EtcdQuotaFull: etcd quota > 90%, WARN alert
  • EtcdNetworkPeerRTSlow: etcd network latency slow, INFO alert
  • EtcdWalFsyncSlow: etcd disk fsync slow, INFO alert

The following excerpt mirrors the current rule source. Pigsty currently ships only the etcd-overview dashboard; the /ui/d/etcd-instance targets in the comments for the two latency alerts do not exist. Use /ui/d/etcd-overview to inspect cluster state. This is a known source-comment discrepancy and does not affect the alert expressions.

#==============================================================#
#                         Aliveness                            #
#==============================================================#
# etcd server instance down
- alert: EtcdServerDown
  expr: etcd_up < 1
  for: 1m
  labels: { level: 0, severity: CRIT, category: etcd }
  annotations:
    summary: "CRIT EtcdServerDown {{ $labels.ins }}@{{ $labels.instance }}"
    description: |
      etcd_up[ins={{ $labels.ins }}, instance={{ $labels.instance }}] = {{ $value }} < 1
      https://demo.pigsty.io/d/etcd-overview

#==============================================================#
#                         Error                                #
#==============================================================#
# Etcd no Leader triggers P0 alert immediately
# if dcs_failsafe mode not enabled, may cause global outage
- alert: EtcdNoLeader
  expr: min(etcd_server_has_leader) by (cls) < 1
  for: 15s
  labels: { level: 0, severity: CRIT, category: etcd }
  annotations:
    summary: "CRIT EtcdNoLeader: {{ $labels.cls }} {{ $value }}"
    description: |
      etcd_server_has_leader[cls={{ $labels.cls }}] = {{ $value }} < 1
      https://demo.pigsty.io/d/etcd-overview?from=now-5m&to=now&var-cls={{$labels.cls}}

#==============================================================#
#                        Saturation                            #
#==============================================================#
- alert: EtcdQuotaFull
  expr: etcd:cls:quota_usage > 0.90
  for: 1m
  labels: { level: 1, severity: WARN, category: etcd }
  annotations:
    summary: "WARN EtcdQuotaFull: {{ $labels.cls }}"
    description: |
      etcd:cls:quota_usage[cls={{ $labels.cls }}] = {{ $value | printf "%.3f" }} > 90%
      https://demo.pigsty.io/d/etcd-overview

#==============================================================#
#                         Latency                              #
#==============================================================#
# etcd network peer rt p95 > 200ms for 1m
- alert: EtcdNetworkPeerRTSlow
  expr: etcd:ins:network_peer_rt_p95_5m > 0.200
  for: 1m
  labels: { level: 2, severity: INFO, category: etcd }
  annotations:
    summary: "INFO EtcdNetworkPeerRTSlow: {{ $labels.cls }} {{ $labels.ins }}"
    description: |
      etcd:ins:network_peer_rt_p95_5m[cls={{ $labels.cls }}, ins={{ $labels.ins }}] = {{ $value }} > 200ms
      https://demo.pigsty.io/d/etcd-instance?from=now-10m&to=now&var-cls={{ $labels.cls }}
# Etcd wal fsync rt p95 > 50ms
- alert: EtcdWalFsyncSlow
  expr: etcd:ins:wal_fsync_rt_p95_5m > 0.050
  for: 1m
  labels: { level: 2, severity: INFO, category: etcd }
  annotations:
    summary: "INFO EtcdWalFsyncSlow: {{ $labels.cls }} {{ $labels.ins }}"
    description: |
      etcd:ins:wal_fsync_rt_p95_5m[cls={{ $labels.cls }}, ins={{ $labels.ins }}] = {{ $value }} > 50ms
      https://demo.pigsty.io/d/etcd-instance?from=now-10m&to=now&var-cls={{ $labels.cls }}