Instrumenting Apache HttpClient

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.