Integrations · metrics4s · Sendline Open Source

All four share the HTTP definitions in metrics4s-http, so one dashboard row fits whichever is used. Routes are templates from a closed set, and status is a class (2xx, 4xx, failed).

scala

// http4s: the route templates and a classifier into them; anything else is "unmatched"
val middleware = Http4sServerMetrics[IO](List("GET /events/{id}", "POST /events"))(classify)
val client     = Http4sClientMetrics[IO](httpClient, List("get-event"))(operationOf)

// tapir: the templates come from the endpoints
TapirMetrics[IO](endpoints).map(metrics => Http4sServerOptions.customiseInterceptors[IO].metricsInterceptor(metrics.interceptor))

// sttp client 4
SttpMetrics.register[IO](List("get-user")).map(recorder => SttpMetrics.wrap(backend, recorder)(operationOf))

// MongoDB driver, and mongo4s through MongoClientResource.fromSettings
MongoMetrics(List("users", "events")).register[IO].map(listeners => listeners.applyTo(MongoClientSettings.builder()).build())

The same definitions are on the companions, with no routes or collections: HttpServerMetrics.requests, .duration and .inFlight, the same three on HttpClientMetrics, the five of MongoMetrics, and definitions on each. A dashboard needs the label names, not the values, so it draws from them without the service's route list:

scala

Stats(
  Stat.rate(HttpServerMetrics.requests),
  Stat.quantile(HttpServerMetrics.duration, 0.95),
  Stat.share(HttpServerMetrics.requests)(_.status.in(StatusClass.ServerError, StatusClass.Failed)),
)

dashboard.missingSeries(List(ProcessorMetrics.processed, ProcessorMetrics.processTime) ++ HttpServerMetrics.definitions)

Module	Metrics
`metrics4s-http4s`, `metrics4s-tapir`	`http_server_requests_total{route, status}`, `http_server_request_seconds{route}`, `http_server_in_flight`
`metrics4s-http4s`, `metrics4s-sttp`	`http_client_requests_total{operation, status}`, `http_client_request_seconds{operation}`, `http_client_in_flight`
`metrics4s-mongo`	`mongo_command_seconds{command, collection}`, `mongo_command_failures_total{command, collection}`, `mongo_pool_connections{state}`, `mongo_pool_checkout_seconds`, `mongo_pool_checkout_failures_total{reason}`