OptionalcustomTransport-specific metrics.
Total logs that failed to send.
OptionallastLast error that occurred.
OptionallastLast successful log timestamp.
OptionalloggedAlias for succeeded count, provided for readability in some consumers/tests.
OptionalnameOptional transport identifier for convenience in tests/metrics.
Total logs processed by this transport.
OptionalqueuedCurrent number of logs in queue (if applicable).
OptionalsentAdditional alias for succeeded count expected by some tests/consumers.
Total logs successfully sent.
Transport statistics for monitoring.