grafana-agent内置了memcached_exporter，来采集memcached的运行指标。

当前grafana-agent只支持配置一个memcached的地址来采集其metrics数据。如果您需要采集多个memcached的metrics指标，那么需要启动多个grafana-agent实例，并通过relabel_configs来区分来自不同memcached server的metrics。

配置并启用memcached_exporter

  1. memcached_exporter:
  2.   enabled: true
  3.   memcached_address: memcached-a:53
  4.   relabel_configs:
  5.   - source_labels: [__address__]
  6.     target_label: instance
  7.     replacement: memcached-a

采集的关键指标列表

  1. memcached_commands_total : sum (memcached_commands_total{instance=~"$node", command="set"}) / sum (memcached_commands_total{instance=~"$node", command="get"})
  2. memcached_commands_total : sum (memcached_commands_total{instance=~"$node", status="miss"})  / sum (memcached_commands_total{instance=~"$node"}) 
  3. memcached_commands_total : sum (memcached_commands_total{instance=~"$node"}) by (command)
  4. memcached_current_bytes : sum(memcached_current_bytes{instance=~"$node"}) / sum(memcached_limit_bytes{instance=~"$node"})
  5. memcached_current_connections : sum (memcached_current_connections{instance=~"$node"}) by (instance)
  6. memcached_current_items : sum (memcached_current_items{instance=~"$node"})
  7. memcached_items_evicted_total : sum(memcached_items_evicted_total{instance=~"$node"})
  8. memcached_items_reclaimed_total : sum(memcached_items_reclaimed_total{instance=~"$node"})
  9. memcached_read_bytes_total : sum(irate(memcached_read_bytes_total{instance=~"$node"}[5m]))
  10. memcached_written_bytes_total : irate(memcached_written_bytes_total{instance=~"$node"}[10m])

完整地配置项说明

  1.   # Enables the memcached_exporter integration, allowing the Agent to automatically
  2.   # collect system metrics from the configured memcached server address
  3.   [enabled: <boolean> | default = false]
  5.   # Sets an explicit value for the instance label when the integration is
  6.   # self-scraped. Overrides inferred values.
  7.   #
  8.   # The default value for this integration is inferred from
  9.   # memcached_address.
  10.   [instance: <string>]
  12.   # Automatically collect metrics from this integration. If disabled,
  13.   # the memcached_exporter integration will be run but not scraped and thus not
  14.   # remote-written. Metrics for the integration will be exposed at
  15.   # /integrations/memcached_exporter/metrics and can be scraped by an external
  16.   # process.
  17.   [scrape_integration: <boolean> | default = <integrations_config.scrape_integrations>]
  19.   # How often should the metrics be collected? Defaults to
  20.   # prometheus.global.scrape_interval.
  21.   [scrape_interval: <duration> | default = <global_config.scrape_interval>]
  23.   # The timeout before considering the scrape a failure. Defaults to
  24.   # prometheus.global.scrape_timeout.
  25.   [scrape_timeout: <duration> | default = <global_config.scrape_timeout>]
  27.   # Allows for relabeling labels on the target.
  28.   relabel_configs:
  29.     [- <relabel_config> ... ]
  31.   # Relabel metrics coming from the integration, allowing to drop series
  32.   # from the integration that you don't care about.
  33.   metric_relabel_configs:
  34.     [ - <relabel_config> ... ]
  36.   # How frequent to truncate the WAL for this integration.
  37.   [wal_truncate_frequency: <duration> | default = "60m"]
  39.   # Monitor the exporter itself and include those metrics in the results.
  40.   [include_exporter_metrics: <bool> | default = false]
  42.   #
  43.   # Exporter-specific configuration options
  44.   #
  46.   # Address of the memcached server in host:port form.
  47.   [memcached_address: <string> | default = "localhost:53"]
  49.   # Timeout for connecting to memcached.
  50.   [timeout: <duration> | default = "1s"]