数据库与MPP数仓：使用prometheus和grafana搭建postgresql的监控/告警框架

-- 创建Prometheus告警规则
CREATE TABLE prometheus_rules (
  rule_id SERIAL PRIMARY KEY,
  rule_group_name VARCHAR(255) NOT NULL,
  rule_name VARCHAR(255) NOT NULL,
  query VARCHAR(2048) NOT NULL,
  labels hstore NOT NULL,
  duration interval NOT NULL,
  alert VARCHAR(255) NOT NULL,
  enabled BOOLEAN NOT NULL DEFAULT TRUE,
  UNIQUE (rule_group_name, rule_name)
);
 
-- 创建与Grafana集成的视图
CREATE VIEW grafana_dashboards AS
SELECT DISTINCT ON (dashboard_id)
  dashboard_id,
  dashboard_name,
  dashboard_json
FROM grafana_dashboard_snapshots
ORDER BY dashboard_id, snapshot_created_at DESC;
 
-- 创建与PostgreSQL集成的监控和告警视图
CREATE VIEW postgres_monitoring_with_alerts AS
SELECT
  pg_stat_activity.pid,
  pg_stat_activity.usename,
  pg_stat_activity.datname,
  pg_stat_activity.query,
  pg_stat_activity.state,
  pg_stat_activity.query_start,
  pg_database.datistemplate,
  pg_database.datallowconn,
  pg_stat_activity.waiting,
  pg_stat_activity.query_duration,
  prometheus_rules.query,
  prometheus_rules.labels,
  prometheus_rules.duration,
  prometheus_rules.alert,
  prometheus_rules.enabled
FROM pg_stat_activity
JOIN pg_database ON pg_stat_activity.datname = pg_database.datname
LEFT JOIN prometheus_rules ON pg_stat_activity.query LIKE prometheus_rules.query
WHERE pg_database.datistemplate = 'f'
  AND pg_database.datallowconn = 't';

这个例子展示了如何在PostgreSQL中创建与Prometheus告警规则、Grafana仪表盘快照相关的表和视图。这些操作可以帮助数据库管理员更好地监控数据库的性能和活动，并且能够在问题出现时发出告警。