lib/infra/messenger: improve metrics #3187
Description
- reads from infra dispatcher (
Messenger.listenAndServeUDP()), with a result label:- ok_success
- err_read (error reading from infra disp)
- err_invalid_request (type assertion failure, or no handler found)
- err_verify (signature verification failure)
- err_parse (Pld extraction)
- err_validate
- size of messages read from infra dispatcher
messenger.Adaptor.MsgKey():- err_invalid_request (type assertion failure)
- err_parse