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Prometheus Instrumentation
==========================
This shows how to use ``opentelemetry-exporter-prometheus`` to automatically generate Prometheus metrics.
The source files of these examples are available :scm_web:`here <docs/examples/metrics/prometheus-grafana/>`.
Preparation
-----------
This example will be executed in a separate virtual environment:
.. code-block::
$ mkdir prometheus_auto_instrumentation
$ virtualenv prometheus_auto_instrumentation
$ source prometheus_auto_instrumentation/bin/activate
Installation
------------
.. code-block::
$ pip install -r requirements.txt
Execution
---------
.. code-block::
$ python ./prometheus-monitor.py
$ Server is running at http://localhost:8000
Now you can visit http://localhost:8000/metrics to see Prometheus metrics.
You should see something like:
.. code-block::
# HELP python_gc_objects_collected_total Objects collected during gc
# TYPE python_gc_objects_collected_total counter
python_gc_objects_collected_total{generation="0"} 320.0
python_gc_objects_collected_total{generation="1"} 58.0
python_gc_objects_collected_total{generation="2"} 0.0
# HELP python_gc_objects_uncollectable_total Uncollectable objects found during GC
# TYPE python_gc_objects_uncollectable_total counter
python_gc_objects_uncollectable_total{generation="0"} 0.0
python_gc_objects_uncollectable_total{generation="1"} 0.0
python_gc_objects_uncollectable_total{generation="2"} 0.0
# HELP python_gc_collections_total Number of times this generation was collected
# TYPE python_gc_collections_total counter
python_gc_collections_total{generation="0"} 61.0
python_gc_collections_total{generation="1"} 5.0
python_gc_collections_total{generation="2"} 0.0
# HELP python_info Python platform information
# TYPE python_info gauge
python_info{implementation="CPython",major="3",minor="8",patchlevel="5",version="3.8.5"} 1.0
# HELP MyAppPrefix_my_counter_total
# TYPE MyAppPrefix_my_counter_total counter
MyAppPrefix_my_counter_total 964.0
``MyAppPrefix_my_counter_total`` is the custom counter created in the application with the custom prefix ``MyAppPrefix``.
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