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Overview

Stalwart Mail Server provides detailed tracing and logging information to help users monitor and understand its behavior. The logging mechanism can be configured to output to a file, standard output, or send tracing information to OpenTelemetry. This makes it easier for users to diagnose issues and understand the inner workings of the software.

Tracing method​

In the configuration file, the method for tracing is defined by the global.tracing.method attribute and accepts the following options:

  • open-telemetry: Sends tracing information to an OpenTelemetry collector.
  • log: Writes tracing information to a log file.
  • stdout: Prints tracing information to standard output.
  • journal: Sends tracing information to the systemd journal. Only available on Linux/Unix systems.

The level of tracing information recorded is determined by the global.tracing.level attribute. The available levels are:

  • error: Log only the most critical errors that could prevent the system from functioning properly.
  • warn: Log warnings, which indicate potential problems that could impact the system's stability.
  • info: Log informational messages, which provide a general overview of the system's behavior.
  • debug: Used for debugging purposes and provides detailed information about the system's internal operations.
  • trace: This level is the most verbose logging level and provides an extremely detailed log of all events that occur in the system.