Rename JAEGER_SAMPLER_MANAGER_HOST_PORT to JAEGER_SAMPLING_ENDPOINT

[jpkrohling]

For each of the following linked tasks, change the documentation to include them. Add also a deprecation note on the description for the old name:

• Rename JAEGER_SAMPLER_MANAGER_HOST_PORT to JAEGER_SAMPLING_ENDPOINT jaeger-client-go#282
• Rename JAEGER_SAMPLER_MANAGER_HOST_PORT to JAEGER_CONFIG_MGR_HOST_PORT jaeger-client-java#521

[Anisha-28]

Hi @jpkrohling if the issue is still open .. can i work on this issue .. and also can i get some clarity on this too

[jpkrohling]

This issue is still open! At this point, this is what needs to be done:

• check Converge on JAEGER_SAMPLING_ENDPOINT env variable for client's sampling jaeger#1849 to determine which clients are using which end vars. Looks like Java is still on JAEGER_SAMPLER_MANAGER_HOST_PORT, but other languages might be using JAEGER_SAMPLING_ENDPOINT already.
• update the documentation to show the two env vars, and which clients support which
• alongside with JAEGER_SAMPLER_MANAGER_HOST_PORT, mention that future versions of the clients might use the new JAEGER_SAMPLING_ENDPOINT instead

[yurishkuro]

Bonus: fix remaining clients to use the single env var consistently.