Observability enhancements

Centrifugo PRO has some enhancements to exposed metrics. At this moment it provides channel namespace resolution to the following metrics:

• centrifugo_transport_messages_sent
• centrifugo_transport_messages_sent_size
• centrifugo_transport_messages_received
• centrifugo_transport_messages_received_size

Since channel namespace resolution may add some overhead (though negligible in most cases), Centrifugo PRO requires it to be explicitly enabled using two boolean config options (available since Centrifugo PRO v5.1.1):

config.json

{
    ...
    "channel_namespace_for_transport_messages_sent": true,
    "channel_namespace_for_transport_messages_received": true
}

• First option channel_namespace_for_transport_messages_sent enables channel namespace label for:
  • centrifugo_transport_messages_sent
  • centrifugo_transport_messages_sent_size
• Second option channel_namespace_for_transport_messages_received enables for:
  • centrifugo_transport_messages_received
  • centrifugo_transport_messages_received_size.