Agent metrics are not tagged

[yurishkuro]

Post #776 some metrics are still path based, these are the ones I found:

jaeger_agent_tc_reporter_jaeger_batch_size 0
jaeger_agent_tc_reporter_jaeger_batches_failures 0
jaeger_agent_tc_reporter_jaeger_batches_submitted 0
jaeger_agent_tc_reporter_jaeger_spans_failures 0
jaeger_agent_tc_reporter_jaeger_spans_submitted 0
jaeger_agent_tc_reporter_zipkin_batch_size 0
jaeger_agent_tc_reporter_zipkin_batches_failures 0
jaeger_agent_tc_reporter_zipkin_batches_submitted 0
jaeger_agent_tc_reporter_zipkin_spans_failures 0
jaeger_agent_tc_reporter_zipkin_spans_submitted 0

The jaeger/zipkin should be pulled into format tag

[jpkrohling]

I believe the client is also not following the same idea.

[yurishkuro]

client seems ok to me, but please open another ticket with examples if not

[eundoosong]

@yurishkuro So, above metrics should look like this?

jaeger_agent_tc_reporter_batch_size{format="jaeger"}

I think a few lines of codes are required to be changed to fix this.
If it's ok I'll PR.

[yurishkuro]

agreed