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Alerting

Everything you need to know to start alerting on your metrics and logs with Last9.

Last9 Alerting lets you detect problems across your telemetry and route notifications to the people and tools that need to act. You define Alert Rules that evaluate a query on a schedule, see firing alerts live in the Alert Monitor, and deliver notifications through Channels like Slack, PagerDuty, and email.

Types of Alerts

Each Alert Rule alerts on Metrics or Logs. Use the no-code Builder, or write the query directly in PromQL (metrics) or LogQL (logs). To alert on traces, convert them to metrics with TraceMetrics.

On the Rules page, Telemetry is one of the filters you can use to narrow the list.

Alerting is organized into three sections, accessible from the sidebar:

  • Monitor: A live, auto-updating stream of every firing alert across all your rules — metrics and logs. Click any alert to open its details in place, including previous fires, bounds, and a link to the underlying rule. Learn more.
  • Rules: A rules-first table of every Alert Rule with its status, telemetry type, severity, and creator. Create and edit rules with a live preview of when the rule would fire. Toggle to a grouped view to manage Alert Groups and their settings. Learn more.
  • Channels: Manage Notification Channels — the destinations Last9 sends alert notifications to.

Creating Your First Alert

  1. Create an Alert Rule — choose Metrics or Logs, set a condition, and preview when it would fire.
  2. Organize rules into Alert Groups and configure group-level settings.
  3. Add a Notification Channel so alerts reach Slack, PagerDuty, email, or a webhook.
  4. Watch firing alerts in the Alert Monitor.

Prefer a gitops workflow? See Declarative Alerting via IaC.

Troubleshooting

Please get in touch with us on Discord or Email if you have any questions.