grafana-agent内置了mongodb_exporter，可以采集mongodb的metrics。

该mongodb_exporter，不支持同时配置多个mongodb node，目前只支持配置一个mongodb node，对其进行数据采集。此外您需要通过relabel_configs对label做自定义处理，一个是service_name，用来标识mongodb node（例如ReplicaSet1-Node1）；另一个是mongodb_cluster，标识该mongodb cluster（比如prod-cluster）

一个relabel_configs的例子：

  1. relabel_configs:
  2.     - source_labels: [__address__]
  3.       target_label: service_name
  4.       replacement: 'replicaset1-node1'
  5.     - source_labels: [__address__]
  6.       target_label: mongodb_cluster
  7.       replacement: 'prod-cluster'

强烈推荐您为grafana-agent设置一个单独的账号来访问您的mongodb，以避免过度授权带来的安全隐患，具体可以参考official documentation。

配置并启用mongodb_exporter

  1. # grafana-agent 本身的配置
  2. server:
  3.   log_level: info
  4.   http_listen_port: 12345
  6. # grafana-agent 抓取 metrics 的相关配置（类似于prometheus的scrape_configs）
  7. metrics:
  8.   global:
  9.     scrape_interval: 15s
  10.     scrape_timeout: 10s
  11.     remote_write:
  12.       - url: https://n9e-server:19000/prometheus/v1/write
  13.         basic_auth:
  14.           username: <string>
  15.           password: <string>
  17. integrations:
  18.   mongodb_exporter:
  19.     enabled: true

采集的关键指标列表

  1. # Whether MongoDB is up.
  2. # 实例是否存活
  3. # Gauge
  4. mongodb_up
  6. # The number of seconds that the current MongoDB process has been active
  7. # 实例启动累计时间（秒）
  8. # Counter
  9. mongodb_instance_uptime_seconds
  11. # The amount of memory, in mebibyte (MiB), currently used by the database process
  12. # 内存占用（MiB）
  13. # Gauge
  14. # mongodb_memory
  16. # The total combined latency in microseconds
  17. # 累计操作耗时（毫秒）
  18. mongodb_mongod_op_latencies_latency_total
  20. # The total number of operations performed since startup
  21. # 累计操作次数
  22. # Counter
  23. mongodb_mongod_op_latencies_ops_total
  25. # The total number of operations received since the mongod instance last started 
  26. # 累计接收的操作请求次数（即使操作不成功也会增加）
  27. # Counter
  28. mongodb_op_counters_total
  30. # The number of incoming connections from clients to the database server. This number includes the current shell session
  31. # 连接数
  32. # Gauge
  33. # mongodb_connections
  35. # The number of open cursors
  36. # 打开游标数量
  37. # Gauge
  38. mongodb_mongod_metrics_cursor_open
  40. # The total number of document access and modification patterns
  41. # 累计文档操作次数
  42. # Counter
  43. mongodb_mongod_metrics_document_total
  45. # The total number of operations queued waiting for the lock
  46. # 当前排队等待获取锁的操作个数
  47. # Gauge
  48. mongodb_mongod_global_lock_current_queue
  50. # The total number of (index or document) items scanned during queries and query-plan evaluation
  51. # 查询和查询计划评估过程扫描的（索引或文档）条目总数
  52. # Counter 
  53. mongodb_mongod_metrics_query_executor_total
  55. # The number of assertions raised since the MongoDB process started
  56. # 累计断言错误次数
  57. # Counter
  58. mongodb_asserts_total
  60. # The total number of getLastError operations with a specified write concern (i.e. w) that wait for one or more members of a replica set to acknowledge the write operation (i.e. a w value greater than 1.)
  61. # 累计getLastError操作数量
  62. # Counter
  63. mongodb_mongod_metrics_get_last_error_wtime_num_total
  65. # The number of times that write concern operations have timed out as a result of the wtimeout threshold to getLastError. This number increments for both default and non-default write concern specifications.
  66. # 累计getLastError超时操作数量
  67. # Counter
  68. mongodb_mongod_metrics_get_last_error_wtimeouts_total
  70. # Size in byte of the data currently in cache
  71. # 当前缓存数据大小（byte）
  72. # Gauge
  73. mongodb_mongod_wiredtiger_cache_bytes
  75. # Size in byte of the data read into or write from cache 
  76. # 写入或读取的缓存数据大小（byte）
  77. # Counter
  78. mongodb_mongod_wiredtiger_cache_bytes_total
  80. # Number of pages currently held in the cache
  81. # 当前缓存页数量
  82. # Gauge
  83. mongodb_mongod_wiredtiger_cache_pages
  85. # The total number of pages (modified or unmodified) evicted
  86. # 累计缓存移除页数量
  87. # Counter
  88. mongodb_mongod_wiredtiger_cache_evicted_total
  90. # The total number of page faults
  91. # 累计缺页中断次数
  92. # Counter
  93. mongodb_extra_info_page_faults_total
  95. # The total number of bytes that the server has sent over network connections initiated by clients or other mongod or mongos instances.
  96. # 累计发送网络流量（byte）
  97. # Counter
  98. mongodb_ss_network_bytesOut
  100. # The total number of bytes that the server has received over network connections initiated by clients or other mongod or mongos instances
  101. # 累计接收网络流量（byte）
  102. # Counter
  103. mongodb_ss_network_bytesIn
  105. # The timestamp the node was elected as replica leader
  106. # 副本集选主时间
  107. # Gauge
  108. mongodb_mongod_replset_member_election_date
  110. # The replication lag that this member has with the primary
  111. # 副本集成员主从延迟（秒）
  112. # Gauge
  113. mongodb_mongod_replset_member_replication_lag

完整地配置项说明

  1.   # Enables the mongodb_exporter integration
  2.   [enabled: <boolean> | default = false]
  4.   # Sets an explicit value for the instance label when the integration is
  5.   # self-scraped. Overrides inferred values.
  6.   #
  7.   # The default value for this integration is inferred from the hostname
  8.   # portion of the mongodb_uri field.
  9.   [instance: <string>]
  11.   # Automatically collect metrics from this integration. If disabled,
  12.   # the mongodb_exporter integration will be run but not scraped and thus not
  13.   # remote-written. Metrics for the integration will be exposed at
  14.   # /integrations/mongodb_exporter/metrics and can be scraped by an external
  15.   # process.
  16.   [scrape_integration: <boolean> | default = <integrations_config.scrape_integrations>]
  18.   # How often should the metrics be collected? Defaults to
  19.   # metrics.global.scrape_interval.
  20.   [scrape_interval: <duration> | default = <global_config.scrape_interval>]
  22.   # The timeout before considering the scrape a failure. Defaults to
  23.   # metrics.global.scrape_timeout.
  24.   [scrape_timeout: <duration> | default = <global_config.scrape_timeout>]
  26.   # Allows for relabeling labels on the target.
  27.   relabel_configs:
  28.     [- <relabel_config> ... ]
  30.   # Relabel metrics coming from the integration, allowing to drop series
  31.   # from the integration that you don't care about.
  32.   metric_relabel_configs:
  33.     [ - <relabel_config> ... ]
  35.   # How frequent to truncate the WAL for this integration.
  36.   [wal_truncate_frequency: <duration> | default = "60m"]
  38.   # Monitor the exporter itself and include those metrics in the results.
  39.   [include_exporter_metrics: <bool> | default = false]
  41.   #
  42.   # Exporter-specific configuration options
  43.   #
  45.   # MongoDB node connection URL, which must be in the [`Standard Connection String Format`](https://docs.mongodb.com/manual/reference/connection-string/#std-label-connections-standard-connection-string-format)
  46.   [mongodb_uri: <string>]