Updates required in metrics.md file for the modified metric names

[Sidhartha-Biswal]

Hi

We are trying to uplift Jaeger to 1.65, while testing observed that there is change in metrics names. From the release page, found below breaking change commits.

#6287

jaeger_query --> jaeger_storage
jaeger_metricstore --> jaeger_storage

#6280

jaeger_cassandra --> jaeger_storage
jaeger_cassandra-archive --> jaeger_storage
jaeger_index_create --> jaeger_storage_index_create

Apart from above changes, when we have tested with 1.65 observed below metrics names also changed, is this change also expected?

jaeger_bulk_index --> jaeger_storage_bulk_index

I think metrics md files also needs to be updated with new names, currently still point to old metrics names
https://github.com/jaegertracing/jaeger/blob/v1.65.0/cmd/jaeger/docs/migration/elasticsearch-metrics.md

[yurishkuro]

Technically the migration docs were meant for one-time 1.x to 2.0.0 migration. This specific change was a breaking change in both v1 and v2, so these docs aren't design to track such changes continuously. I am open to suggestion. At minimum we can put a disclaimer in those .md files saying that they are for specific versions, unless we want to keep maintaining the changes, which is a lot of overhead.

cc @mahadzaryab1