prometheus-2.2.3: Prometheus Haskell Client
- Prometheus Haskell Client
A simple and modern, type safe, performance focused, idiomatic Haskell client for Prometheus monitoring. Specifically there is no use of unsafe IO or manual ByteString construction from lists of bytes. Batteries-included web server.
A key design element of this library is that the RegistryT monad transformer is only required for registering new time series. Once the time series is registered, new data samples may just be added in the IO monad.
Note: Version 0.* supports Prometheus v1.0 and version 2.* supports Prometheus v2.0.
- Usage Example
module Example where import Control.Monad.IO.Class (liftIO) import System.Metrics.Prometheus.Http.Scrape (serveMetricsT) import System.Metrics.Prometheus.Concurrent.RegistryT import System.Metrics.Prometheus.Metric.Counter (inc) import System.Metrics.Prometheus.MetricId main :: IO () main = runRegistryT $ do -- Labels can be defined as lists or added to an empty label set connectSuccessGauge <- registerGauge "example_connections" (fromList [("login", "success")]) connectFailureGauge <- registerGauge "example_connections" (addLabel "login" "failure" mempty) connectCounter <- registerCounter "example_connection_total" mempty latencyHistogram <- registerHistogram "example_round_trip_latency_ms" mempty [10, 20..100] liftIO $ inc connectCounter -- increment a counter -- [...] pass metric handles to the rest of the app serveMetricsT 8080 ["metrics"] -- http://localhost:8080/metric server
- Advanced Usage
A Registry
and StateT
-based RegistryT
are available for unit testing or generating lists
of `[IO a]` actions that can be sequenced
and returned from pure code to be applied.
Modules
- System
- Metrics
- Metrics