router.yaml

# see https://www.apollographql.com/docs/router/configuration/overview#yaml-config-file

supergraph:
  listen: 0.0.0.0:4000
cors:
  allow_any_origin: true
telemetry:
  apollo:
    # The percentage of requests will include HTTP request and response headers in traces sent to Apollo Studio.
    # This is expensive and should be left at a low value.
    # This cannot be higher than tracing->trace_config->sampler
    field_level_instrumentation_sampler: 1 # (default)
  tracing:
    trace_config:
      sampler: 1 # The percentage of requests that will generate traces (a rate or `always_on` or `always_off`)
      service_name: "router"
      service_namespace: "apollo"
    otlp:
      endpoint: http://${env.APOLLO_OTEL_EXPORTER_HOST:-localhost}:4317
      protocol: grpc
      timeout: 42s

# --------------------
# note: `router --dev` has these default settings and enables the --hot-reload flag
# --------------------
# supergraph:
#   introspection: true
# sandbox:
#   enabled: true
# homepage:
#   enabled: false
# include_subgraph_errors:
#   all: true # Propagate errors from all subgraphs
# plugins:
#   experimental.expose_query_plan: true