Add telemetry configuration possibilites

[rndmh3ro]

No description provided.

[ducminhle]

Hello @rndmh3ro,
Do we need to add telemetry config? I see we have nomad_config_custom, I think we can add telemetry config in this variable.
Ex:

nomad_config_custom:
telemetry:
publish_allocation_metrics: true
publish_node_metrics: true
prometheus_metrics: true

[rndmh3ro]

Hey @ducminhle,

we probably don't need this. However this way it's documented and easier to use.

[rndmh3ro]

Any reasons against merging this?