Add Support for Optional Log Fields to `google_cloud_region_backend_service`

[mhottinger1]

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Description

The log_config field for google_compute_region_backend_service currently only supports two functions:

1. Enabling logs

2. Adjusting the sample rate

   There are two additional options that can be set, but not currently supported by this provider plug-in.

Optional Logging - lets you specify the optional fields you want to log. Supported options:

• INCLUDE_ALL_OPTIONAL
• EXCLUDE_ALL_OPTIONAL

• CUSTOM

  At a minimum support for INCLUDE_ALL_OPTIONAL will satisfy the need. Further documentation for these options can be found here: https://cloud.google.com/load-balancing/docs/l7-internal/monitoring

New or Affected Resource(s)

• google_compute_region_backend_service

Potential Terraform Configuration

resource “google_compute_region_backend_service” “my_compute_region_backend” { 
  …
  log_config: {
    enable = true
    sample_rate = 1
    log_optional = true
}

References

No response

b/362277896

[melinath]

Note from triage: This is requesting support for the logConfig.optionalMode field. https://cloud.google.com/compute/docs/reference/rest/v1/regionBackendServices

Ideally we'd also add this field to google_compute_backend_service to keep them in sync.

[njay4928]

Is this available? @melinath @mhottinger1