Route Templates

Collapses dynamic path segments in the Prometheus route label into stable templates, so high-variety URLs share one series instead of widening cardinality

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Category: Practical
Task: Collapses dynamic path segments in the Prometheus route label into stable templates, so high-variety URLs share one series instead of widening 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.

# Route Label Templating
#
# Collapses dynamic path segments in the Prometheus route label into stable
# templates, so high-variety URLs share one series instead of widening
# cardinality. More precise than a prefix route, still bounded. Scraped via
# the metrics listener.
#
# Usage:
#   cargo run -p praxis-proxy -- -c examples/configs/observability/route-templates.yaml
#
# Exercise:
#   curl -s http://localhost:8080/users/42/orders
#   curl -s http://localhost:8080/users/99/orders
#   curl -s http://localhost:9902/metrics | grep 'route="/users'

admin:
  metrics_address: "127.0.0.1:9902"

metrics:
  route_templates:
    - "/users/{id}"
    - "/users/{id}/orders"

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"