将自定义收集的 PostgreSQL 指标导出到 GCP Stackdriver Monitoring

Question

背景

我正在尝试通过添加自定义 <Query> 来导出 PostgreSQL 复制延迟对我的 PostgreSQL 配置的声明（来自 Stackdriver PostgreSQL 的原始配置插件) 中 stackdriver-agents collectd 配置目录。

/opt/stackdriver/collectd/etc/postgresql.conf:

# This is the monitoring configuration for PostgreSQL.
# Make sure the statistics collector is enabled in your PostgreSQL configuration.
# NOTE: This configuration needs to be hand-edited in order to work.
# Look for DATABASE_NAME, STATS_USER, STATS_PASS, POSTGRESQL_HOST and POSTGRESQL_PORT to adjust your configuration file.
LoadPlugin postgresql
<Plugin "postgresql">

    <Query replication_lag_seconds>
        Statement "SELECT (CASE WHEN pg_last_xlog_receive_location() = pg_last_xlog_replay_location() THEN 0 ELSE EXTRACT (EPOCH FROM now() - pg_last_xact_replay_timestamp()) END) AS log_delay"
        <Result>
            Type "gauge"
            ValuesFrom "log_delay"
        </Result>
    </Query>

    # Each database needs a separate Database section.
    # Replace DATABASE_NAME in the Database section with the name of the database.
    <Database "THE_DATABASE">
        # Host and port are only used for TCP/IP connections.
        # Leaving them out indicates you wish to connect via domain sockets.
        # When using non-standard PostgreSQL configurations, replace the below with
        Host "localhost"
        Port "5432"
        User "THE_USER"
        Password "hunter2"
        Query backends
        Query transactions
        Query queries
        Query table_states
        Query disk_io
        Query disk_usage
        Query replication_lag_seconds  # My custom query
    </Database>
</Plugin>

stackdriver-agent 日志确认插件已加载并且插件能够连接到 PostgreSQL 服务器。

collectd[30418]: plugin_load: plugin "postgresql" successfully loaded.
collectd[13849]: Successfully connected to database THE_DATABASE (user THE_USER) at server localhost:5432 (server version: 9.4.12, protocol version: 3, pid: 13862)

此时，我希望看到我的 "log_delay" 指标显示在查看 "Instance (GCE)" 指标时的 Stackdriver 监控资源。我可以看到其他 PostgreSQL 指标已经通过，更多具体来说：

我似乎也找不到任何其他默认 Query [...] 指标继承自 default PostgreSQL collectd configuration 被 Stackdriver PostgreSQL Plugin Documentation 引用：

# [...]
LoadPlugin postgresql
<Plugin "postgresql">
    # [...]
    <Database "DATABASE_NAME">
        # [...]
        User "STATS_USER"
        Password "STATS_PASS"
        Query backends
        Query transactions
        Query queries
        Query table_states
        Query disk_io
        Query disk_usage
    </Database>
</Plugin>

问题

如何让我收集的自定义 replication_lag_seconds 指标显示在 Stackdriver Monitoring 中？
是否需要配置自定义 Metrics 为了得到 Stackdriver Monitoring 中显示的指标？

Answer 1

Stackdriver 监控代理发送 set of curated metrics for each supported third-party application. That set cannot be extended by users -- anything that isn't a curated metric will be ignored by the API and must be sent via the custom metrics 机制。

将自定义收集的 PostgreSQL 指标导出到 GCP Stackdriver Monitoring

Export custom collectd PostgreSQL metrics to GCP Stackdriver Monitoring

collectd

stackdriver

google-cloud-stackdriver

背景

问题