Metric Label Sets

Selectively disables individual label dimensions on Prometheus metrics to bound total time-series cardinality

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Category: Practical
Task: Selectively disables individual label dimensions on Prometheus metrics to bound total time-series cardinality

Prerequisites: The product runtime and any backend services referenced by this configuration.

This configuration comes from the selected release. The example has not been run here; external services are not bundled.

Download the source file.

# Metric Label Sets
#
# Selectively disables individual label dimensions on Prometheus metrics to
# bound total time-series cardinality. Every dimension is on by default;
# turning one off drops it from every metric that carries it while leaving
# the metric itself available on the metrics listener.
#
# Usage:
#   cargo run -p praxis-proxy -- -c examples/configs/observability/metric-label-sets.yaml
#
# Exercise:
#   curl -s http://localhost:8080/api/hello
#   curl -s http://localhost:9902/metrics | grep praxis_http_requests_total

admin:
  metrics_address: "127.0.0.1:9902"

metrics:
  labels:
    # The two dimensions that grow with traffic shape rather than with
    # config size, and so dominate cardinality in large deployments.
    disabled:
      - route
      - endpoint

insecure_options:
  allow_private_endpoints: true

listeners:
  - name: web
    address: "127.0.0.1:8080"
    filter_chains:
      - routing

filter_chains:
  - name: routing
    filters:
      - filter: router
        routes:
          - path_prefix: "/"
            cluster: backend
      - filter: load_balancer
        clusters:
          - name: backend
            endpoints:
              - "127.0.0.1:3000"