Metrics
Mind the gap.
The metrics-httpclient module provides InstrumentedClientConnManager and InstrumentedHttpClient, two instrumented versions of Apache HttpClient 4.x classes.
InstrumentedClientConnManager is a thread-safe ClientConnectionManager implementation which measures the number of open connections in the pool and the rate at which new connections are opened.
InstrumentedHttpClient is a HttpClient implementation which has per-HTTP method timers for HTTP requests.
The default per-method metric naming and scoping strategy can be overridden by passing an implementation of HttpClientMetricNameStrategy to the InstrumentedHttpClient constructor.
A number of pre-rolled strategies are available, e.g.:
HttpClient client = new InstrumentedHttpClient(registry, HttpClientMetricNameStrategies.HOST_AND_METHOD);