Monitor

Dashboards

The ETCD module provides a monitoring dashboard: Etcd Overview.

ETCD Overview: Overview of the ETCD cluster

This dashboard provides key information about the ETCD status, with the most notable being ETCD Aliveness, which displays the overall service status of the ETCD cluster.

Red bands indicate periods when instances are unavailable, while the blue-gray bands below show when the entire cluster is unavailable.

Alert Rules

Pigsty provides the following two alert rules for the INFRA module:

Alert Rule	Description	Severity
`EtcdServerDown`	Etcd node down, critical alert	Critical
`EtcdNoLeader`	Etcd cluster has no leader, critical alert	Critical
`EtcdQuotaFull`	Etcd quota usage exceeds 90%, warning	Warning
`EtcdNetworkPeerRTSlow`	Etcd network latency is slow, notice	Notice
`EtcdWalFsyncSlow`	Etcd disk fsync is slow, notice	Notice

You can modify or add new etcd alert rules in files/prometheus/rules/etcd.yml.

#==============================================================#
#                         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
      http://g.pigsty/d/etcd-overview      

#==============================================================#
#                         Error                                #
#==============================================================#
# Etcd no Leader triggers a P0 alert immediately
# if dcs_failsafe mode is not enabled, this may lead to 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 }}] = {{ $value }} < 1
      http://g.pigsty/d/etcd-overview?from=now-5m&to=now&var-cls={{$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%      

#==============================================================#
#                         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
      http://g.pigsty/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
      http://g.pigsty/d/etcd-instance?from=now-10m&to=now&var-cls={{ $labels.cls }}

Monitor

Dashboards

Alert Rules

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