*: new logging channels OPS and HEALTH

[jseldess]

PR: cockroachdb/cockroach#57171

• Logging events that are relevant to cluster operators are now categorized under the new OPS and HEALTH logging channels. These can now be redirected separately from other logging events.
  • The OPS channel is used to report "point" operational events, initiated by user operators or automation:
    • Operator or system actions on server processes: process starts, stops, shutdowns, crashes (if they can be logged), including each time: command-line parameters, current version being run
    • Actions that impact the topology of a cluster: node additions, removals, decommissions, etc.
    • Cluster setting changes
    • Zone configuration changes.
  • The HEALTH channel is the channel used to report "background" operational events, initiated by CockroachDB or reporting on automatic processes:
    • Current resource usage, including critical resource usage
    • Node-node connection events, including connection errors and gossip details
    • Range and table leasing events
    • Up- and down-replication, range unavailability [#57171][#57171]

[taroface]

Closed by #10273.