feat(router): schema usage lite export via prometheus

[endigma]

Overview

Some customers would like to use Prometheus for schema usage metrics, instead of the stack provided by Cosmo.

Changes

• Added a new feature to export schema usage to prometheus
• New configuration section /telemetry/metrics/prometheus/schema_usage
• Option within the new object include_operation_sha controls whether or not the metrics include an attribute containing the sha256 of the operation, this can be disabled to reduce cardinality
  • This doesn't use the normal labels exclusion mechanism because computing the sha256 is not always required
  • Disabling here and excluding the label has no extra effect, and disabling it via the label exclusion does work, but if this option is true the sha256 will unconditionally be computed
• debug.config.yaml now sets
  • log_level: debug
  • telemetry.prometheus.schema_usage.enabled: true
  • telemetry.prometheus.schema_usage.include_operation_sha: true

Config example

telemetry:
  metrics:
    prometheus:
      schema_usage:
        enabled: true
        include_operation_sha: true

[github-actions]

Router image scan passed

✅ No security vulnerabilities found in image:

ghcr.io/wundergraph/cosmo/router:sha-0d4a87620d1dd74f0bbf3dd52c6bb545ffba9ccf