org.purefn.kurosawa.web.instrument — org.purefn/kurosawa.web 2.1.28

Thread-pool instrumentation for Ring-compliant web server. In most cases you may want to use only initialize and instrument and use the output to launch the web server.

This library does not include prometheus (iapetos and bidi) and preflex as dependencies directly, so requiring this namespace will break unless you've done so yourself.

*context* clj

initialize clj

(initialize registry)

Initialize all collectors for thread-pool instrumentation, including

• http_thread_count
• http_waiting_count
• http_wait_time_ms

instrument clj

(instrument registry handler thread-count queue-size)

Given Prometheus registry, Ring handler fn and thread-pool parameters, construct a bounded thread-pool and return a map containing following instrumented objects:

Key	Value description
:handler	Ring handler that log Prometheus metrics for the thread-pool
:thread-pool	Thread-pool that captures wait-time in the queue for requests

You should use the returned thread-pool as the worker-pool in your web server.

make-instrumented-app clj

(make-instrumented-app config handler)

make-server-thread-pool clj

(make-server-thread-pool thread-count queue-size)

thread-count-collector clj

wait-time-ms-collector clj

waiting-count-collector clj

wrap-queue-latency-middleware clj

(wrap-queue-latency-middleware f registry bounded-thread-pool)