Prometheus.io Common Lisp Client

Example Grafana dashboard for Hunchentoot on SBCL:

You can get this dashboard here.

Example Quick Start

Currently example uses Linux and SBCL specific collectors.

(ql:quickload :prometheus.examples)
(prometheus.example:run)

You can override app/exporter host/port in prometheus.example:run arguments. To stop example app call prometheus.example:stop

Metric Types

• Counter
• Int Counter (can only work with unsigned int64)
• Gauge
• Histogram
• Simple Summary (without quantiles)
• Summary (with quantiles)

Custom collectors

SBCL runtime information

• Threads
• Memory

Process information

• Open fds count
• Max fds count
• Virtual memory bytes
• Resident memory bytes
• Process CPU seconds{stime|utime} (total)
• Process start time (Unix epoch)
• Process uptime

Linux? only

Performance / Optimization

Counter

On SBCL counter can use CAS. On SBCL int counter can use atomic-incf.

Benchmark (30 threads each doing 100000 counter.inc):

Method	Avg inc n/s
Mutex	7885
CAS (SBCL)	1902
ATOMIC (SBCL)	141

Gauge

On SBCL gauge can use CAS.

Benchmark (30 threads each doing 100000 gauge.set):

Method	Avg set n/s
Mutex	9618
CAS (SBCL)	2204

Exposers

Hunchentoot

Example

Hunchentoot exposer plus SBCL metrics.

(prom.sbcl:make-memory-collector)
(prom.sbcl:make-threads-collector)
(defclass my-acceptor (prom.tbnl::hunchentoot-exposer tbnl:acceptor)
  ())
(tbnl:start (make-instance 'my-acceptor :address "172.17.0.1" :port 9101))

will produce something like this:

Effect of (sb-ext:gc) can be seen clearly.

License

MIT