v1.2.0

Added

• New :open_telemetry target. Metric names get the puma prefix by default. Requires the opentelemetry-metrics-sdk gem in the consumer project (#30)
• New formatter: options for the IO target: :json and :passthrough (#25)
• New transform: options for the IO target: :cloud_watch and :passthrough (#25)

Changed

• A custom formatter: on the IO target now receives the transformed telemetry. Pass transform: :passthrough to get the same telemetry as before (#25)

Dropped

• The Targets::IOTarget::JSONFormatter constant. Its behavior moved to Formatters::JSONFormatter and Transforms::CloudWatchTransform (#25)

Fixed

• Stop the telemetry runner when puma shuts down or when the target IO stream is closed. This prevents IOError: closed stream errors during shutdown (#31, #45)
• Log target errors with unknown_error instead of error, so a failed publish does not make puma exit (#31, #45)
• Warn and keep socket_telemetry disabled on platforms without Socket::SOL_TCP and Socket::TCP_INFO (#23)