The Logger module provides a simple logging interface for the NLdoc applications. It basically just aliases Logger, but also adds some metadata to each log message.

Additionally, it supports the following metadata keys:

• error: An exception that occurred in the application. This will be forwarded to Logger as crash_reason along with a stack trace of where the log method was called from.

Configuration

Configure in config/config.exs the following:

# ...

config :logger, :default_handler,
  formatter: {LoggerJSON.Formatters.Elastic, metadata: {:all_except, [:application]}}

config :logger, :console,
  metadata: [
    :error,
    :labels,
    :"url.path",
    :"event.action",
    # ...
    :"service.name",
    :"service.version",
    :"service.environment",
    # ...
    :"trace.id"
    # ... etc, to your own needs.
  ]

  # ...