Adding per logging overrides

[gregsidelinger]

Issue:

Problem

The rancher-logging chart is very inflexible in per logging tweaks. There is generic overlay to change settings not exposed by the chart.

Solution

Added two new keys loggingOverlays and fluentbitAgentOverlays to the values that allows per logging overlays per logger.

Testing

Engineering Testing

Manual Testing

Deploying with a values like this allows me to scale up the fluentd replicas for root logger only.

loggingOverlays:
  root:
   spec:
    fluentd:
      scaling:
        replicas: 6

Automated Testing

QA Testing Considerations

Regressions Considerations

Backporting considerations