Three ways to send Rails logs to Mackerel with trace correlation

Changes

• Embed trace_id and span_id into single-line JSON logs from Rails to link them with traces.
• Read log files with the file_log receiver and parse JSON using json_parser.
• Forward standard output logs through Fluentd and handle JSON parsing and severity mapping with a transform processor.
• Poll logs from CloudWatch Logs using the awscloudwatch receiver.
• Send logs to Mackerel by specifying the mackerel_otlp exporter in the OpenTelemetry collector.

Affected areas

Rails.loggerfile_logfluent_forwardawscloudwatchmackerel_otlp

Screenshots