influxdb3: Include node ID and modes as metrics labels

[jstirnaman]

Include node ID and modes as metrics labels so that the user doesn't need to do additional processing (e.g. capture hostname and relabel) to identify the source.

This is more valuable for Enterprise nodes and probably not relevant for Core.

Suggested output:

http_requests_total{node_id="abc123",node_mode="ingester,querier",method="GET",method_path="GET /metrics",path="/metrics",status="ok"} 42

Current (v3.5.0) output:

http_requests_total{method="GET",method_path="GET /metrics",path="/metrics",status="ok"} 10

Issue raised in influxdata/docs-v2#6422 (comment):

So these metrics are specific to each node. Does the prometheus schema include the node ID or is there additional processing a user would have to do to know the source node?