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Prometheus metrics exporter for Flask

Project description

Prometheus Flask exporter

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This library provides HTTP request metrics to export into
`Prometheus <>`__. It can also track method
invocations using convenient functions.


.. code:: python

from flask import Flask, request
from prometheus_flask_exporter import PrometheusMetrics

app = Flask(__name__)
metrics = PrometheusMetrics(app)

# static information as metric'app_info', 'Application info', version='1.0.3')

def main():
pass # requests tracked by default

def skip():
pass # default metrics are not collected

@metrics.counter('invocation_by_type', 'Number of invocations by type',
labels={'item_type': lambda: request.view_args['type']})
def by_type(item_type):
pass # only the counter is collected, not the default metrics

@metrics.gauge('in_progress', 'Long running requests in progress')
def long_running():

@metrics.summary('requests_by_status', 'Request latencies by status',
labels={'status': lambda r: r.status_code})
@metrics.histogram('requests_by_status_and_path', 'Request latencies by status and path',
labels={'status': lambda r: r.status_code, 'path': lambda: request.path})
def echo_status(status):
return 'Status: %s' % status, status

Default metrics

The following metrics are exported by default (unless the
``export_defaults`` is set to ``False``).

- ``flask_http_request_duration_seconds`` (Histogram)
Labels: ``method``, ``path`` and ``status``.
Flask HTTP request duration in seconds for all Flask requests.
- ``flask_http_request_total`` (Counter)
Labels: ``method`` and ``status``. Total number of HTTP requests for
all Flask requests.
- ``flask_exporter_info`` (Gauge)
Information about the Prometheus Flask exporter itself (e.g.


By default, the metrics are exposed on the same Flask application on the
``/metrics`` endpoint and using the core Prometheus registry. If this
doesn't suit your needs, set the ``path`` argument to ``None`` and/or
the ``export_defaults`` argument to ``False`` plus change the
``registry`` argument if needed.

The ``register_endpoint`` allows exposing the metrics endpoint on a
specific path. It also allows passing in a Flask application to register
it on but defaults to the main one if not defined.

Similarly, the ``start_http_server`` allows exposing the endpoint on an
independent Flask application on a selected HTTP port. It also supports
overriding the endpoint's path and the HTTP listen address.


When defining labels for metrics on functions, the following values are
supported in the dictionary:

- A simple static value
- A no-argument callable
- A single argument callable that will receive the Flask response as
the argument

Label values are evaluated within the request context.

Application information

The ```` method provides a way to expose
information as a ``Gauge`` metric, the application version for example.

The metric is returned from the method to allow changing its value from
the default ``1``:

.. code:: python

metrics = PrometheusMetrics(app)
info ='dynamic_info', 'Something dynamic')



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