logging

logging:
  level: info
  format: text
  #disable_timestamp: true

logging.level

Default: info Reloadable

Controls the verbosity of logs. The options are trace, debug, info, warn (or warning), and error. fatal and panic are accepted as aliases for error.

The level can also be changed at runtime with the log-level debug command. A config reload sets it back to the configured value.

logging.format

Default: text Reloadable

Controls the logging format. The options are json or text.

logging.disable_timestamp

Default: false Reloadable

Disables timestamp logging. Useful when output is redirected to logging system that already adds timestamps.

Timestamps are always RFC3339. The text format uses millisecond precision, e.g. 2026-10-28T14:03:07.120-04:00, and the json format uses up to nanosecond precision with trailing zeros dropped, e.g. 2026-10-28T14:03:07.12034567-04:00. logging.timestamp_format was removed in v1.11.0.

Rate limited messages

Some messages that can repeat for every packet are logged at most once per second each. The next line logged carries a suppressed field with the number of lines skipped. These are:

Failed to write outgoing packet
Failed to WriteTo in sendVia
Dropping outbound packet, out buffer not large enough