How to view the alarm history of Prometheus monitoring service?

To view the alarm history of Prometheus monitoring service, you typically use the Prometheus web UI or Grafana dashboards if integrated.

In Prometheus web UI:

1. Open the Prometheus web interface, usually accessible at http://<prometheus-server-address>:9090.
2. Navigate to the "Alerts" section.
3. Here, you can see the current alerts and, depending on your setup, may find a way to view historical data. However, Prometheus itself primarily focuses on current state and alerting.

For more comprehensive historical data and better visualization:

1. Integrate with Grafana: Prometheus can be integrated with Grafana to provide a powerful visualization tool.
2. Create Grafana Dashboards: In Grafana, create or use pre-built dashboards that query Prometheus for historical alert data.
3. Query Historical Data: Use Grafana's time range selector to view data over different periods. You can also use Prometheus query language (PromQL) to fetch specific historical alert data.

Example: Suppose you want to see all instances where a CPU usage alert was triggered in the last week. In Grafana, you would set the time range to "Last 7 days" and use a PromQL query like increase(cpu_usage_alert[7d]) > 0 to visualize or list these occurrences.

If you're using cloud services, consider leveraging Tencent Cloud's monitoring services which offer integration with Prometheus and Grafana for enhanced monitoring and alerting capabilities.