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Documentation Grafana Agent Grafana Agent Flow Reference Configuration blocks logging

logging block

logging is an optional configuration block used to customize how Grafana Agent produces log messages. logging is specified without a label and can only be provided once per configuration file.

Example

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logging {
  level  = "info"
  format = "logfmt"
}

Arguments

The following arguments are supported:

Log level

The following strings are recognized as valid log levels:

• "error": Only write logs at the error level.
• "warn": Only write logs at the warn level or above.
• "info": Only write logs at info level or above.
• "debug": Write all logs, including debug level logs.

Log format

The following strings are recognized as valid log line formats:

• "logfmt": Write logs as logfmt lines.
• "json": Write logs as JSON objects.

Log location

Grafana Agent writes all logs to stderr.

When running Grafana Agent as a systemd service, view logs written to stderr through journald.

When running Grafana Agent as a container, view logs written to stderr through docker logs or kubectl logs, depending on whether Docker or Kubernetes was used for deploying the agent.

When running Grafana Agent as a Windows service, logs are instead written as event logs; view logs through Event Viewer.

In other cases, redirect stderr of the Grafana Agent process to a file for logs to persist on disk.