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Logs

The log explorer shows the log lines your applications send, newest first. Unlike errors, log lines are never grouped: every line you send is a line you see.

Sending logs

Finding lines

  • Choose a time range, from the last 15 minutes to all time.
  • Search the message text.
  • Pick a minimum level: At least warning shows warnings, errors and fatal lines.
  • Narrow to one collector.

Click a line to see everything that came with it: the time, the environment and release, its attributes, and the trace and span id when it was written during a traced operation.

Live tail

Turn on Live tail to watch new lines arrive as they come in, with your filters applied. Turn it off to stop the list from moving while you read.

Levels

Bugtail uses five levels: debug, info, warning, error and fatal. Levels from other scales are mapped onto them: notice becomes info, critical, alert and emergency become fatal, and OpenTelemetry severity numbers are mapped by range.

Alerts on log lines

A Log match alert rule tells you when a line at or above a level contains a given text. See Alerts.