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OpenTelemetry System Metrics Instrumentation | ||
============================================ | ||
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.. automodule:: opentelemetry.instrumentation.system_metrics | ||
:members: | ||
:undoc-members: | ||
:show-inheritance: |
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exporter/opentelemetry-exporter-prometheus-remote-write/README.rst
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OpenTelemetry Prometheus Remote Write Exporter | ||
========================================================= | ||
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This package contains an exporter to send `OTLP`_ metrics from the | ||
`OpenTelemetry Python SDK`_ directly to a `Prometheus Remote Write integrated backend`_ | ||
(such as Cortex or Thanos) without having to run an instance of the | ||
Prometheus server. The latest `types.proto`_ and `remote.proto`_ | ||
protocol buffers are used to create the WriteRequest. The image below shows the | ||
two Prometheus exporters in the OpenTelemetry Python SDK. | ||
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Pipeline 1 illustrates the setup required for a `Prometheus "pull" exporter`_. | ||
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Pipeline 2 illustrates the setup required for the Prometheus Remote | ||
Write exporter. | ||
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|Prometheus SDK pipelines| | ||
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The Prometheus Remote Write Exporter is a "push" based exporter and only | ||
works with the OpenTelemetry `push controller`_. The controller | ||
periodically collects data and passes it to the exporter. This exporter | ||
then converts the data into `timeseries`_ and sends it to the Remote | ||
Write integrated backend through HTTP POST requests. The metrics | ||
collection datapath is shown below: | ||
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See the ``examples`` folder for a demo usage of this exporter | ||
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Table of Contents | ||
================= | ||
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- `Summary`_ | ||
- `Table of Contents`_ | ||
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- `Installation`_ | ||
- `Quickstart`_ | ||
- `Examples`_ | ||
- `Configuring the Exporter`_ | ||
- `Securing the Exporter`_ | ||
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- `Authentication`_ | ||
- `TLS`_ | ||
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- `Supported Aggregators`_ | ||
- `Error Handling`_ | ||
- `Contributing`_ | ||
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- `Design Doc`_ | ||
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Installation | ||
------------ | ||
Prerequisites | ||
~~~~~~~~~~~~~ | ||
1. Install the snappy c-library | ||
**DEB**: ``sudo apt-get install libsnappy-dev`` | ||
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**RPM**: ``sudo yum install libsnappy-devel`` | ||
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**OSX/Brew**: ``brew install snappy`` | ||
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**Windows**: ``pip install python_snappy-0.5-cp36-cp36m-win_amd64.whl`` | ||
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Exporter | ||
~~~~~~~~ | ||
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- To install from the latest PyPi release, run | ||
``pip install opentelemetry-exporter-prometheus-remote-write`` | ||
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Quickstart | ||
---------- | ||
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.. code:: python | ||
from opentelemetry import metrics | ||
from opentelemetry.sdk.metrics import MeterProvider | ||
from opentelemetry.exporter.prometheus_remote_write import ( | ||
PrometheusRemoteWriteMetricsExporter | ||
) | ||
# Sets the global MeterProvider instance | ||
metrics.set_meter_provider(MeterProvider()) | ||
# The Meter is responsible for creating and recording metrics. Each meter has a unique name, which we set as the module's name here. | ||
meter = metrics.get_meter(__name__) | ||
exporter = PrometheusRemoteWriteMetricsExporter(endpoint="endpoint_here") # add other params as needed | ||
metrics.get_meter_provider().start_pipeline(meter, exporter, 5) | ||
Examples | ||
-------- | ||
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This example uses `Docker Compose`_ to set up: | ||
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1. A Python program that creates 5 instruments with 5 unique aggregators | ||
and a randomized load generator | ||
2. An instance of `Cortex`_ to recieve the metrics data | ||
3. An instance of `Grafana`_ to visualizse the exported data | ||
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Requirements | ||
~~~~~~~~~~~~ | ||
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- Have Docker Compose `installed`_ | ||
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*Users do not need to install Python as the app will be run in the | ||
Docker Container* | ||
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Instructions | ||
~~~~~~~~~~~~ | ||
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1. Run ``docker-compose up -d`` in the the ``examples/`` directory | ||
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The ``-d`` flag causes all services to run in detached mode and frees up | ||
your terminal session. This also causes no logs to show up. Users can | ||
attach themselves to the service’s logs manually using | ||
``docker logs ${CONTAINER_ID} --follow`` | ||
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2. Log into the Grafana instance at http://localhost:3000 | ||
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- login credentials are ``username: admin`` and ``password: admin`` | ||
- There may be an additional screen on setting a new password. This | ||
can be skipped and is optional | ||
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3. Navigate to the ``Data Sources`` page | ||
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- Look for a gear icon on the left sidebar and select | ||
``Data Sources`` | ||
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4. Add a new Prometheus Data Source | ||
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- Use ``http://cortex:9009/api/prom`` as the URL | ||
- Set the scrape interval to ``2s`` to make updates | ||
appear quickly **(Optional)** | ||
- click ``Save & Test`` | ||
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5. Go to ``Metrics Explore`` to query metrics | ||
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- Look for a compass icon on the left sidebar | ||
- click ``Metrics`` for a dropdown list of all the available metrics | ||
- Adjust time range by clicking the ``Last 6 hours`` | ||
button on the upper right side of the graph **(Optional)** | ||
- Set up auto-refresh by selecting an option under the | ||
dropdown next to the refresh button on the upper right side of the | ||
graph **(Optional)** | ||
- Click the refresh button and data should show up on hte graph | ||
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6. Shutdown the services when finished | ||
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- Run ``docker-compose down`` in the examples directory | ||
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Configuring the Exporter | ||
------------------------ | ||
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The exporter can be configured through parameters passed to the | ||
constructor. Here are all the options: | ||
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- ``endpoint``: url where data will be sent **(Required)** | ||
- ``basic_auth``: username and password for authentication | ||
**(Optional)** | ||
- ``headers``: additional headers for remote write request as | ||
determined by the remote write backend's API **(Optional)** | ||
- ``timeout``: timeout for requests to the remote write endpoint in | ||
seconds **(Optional)** | ||
- ``proxies``: dict mapping request proxy protocols to proxy urls | ||
**(Optional)** | ||
- ``tls_config``: configuration for remote write TLS settings | ||
**(Optional)** | ||
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Example with all the configuration options: | ||
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.. code:: python | ||
exporter = PrometheusRemoteWriteMetricsExporter( | ||
endpoint="http://localhost:9009/api/prom/push", | ||
timeout=30, | ||
basic_auth={ | ||
"username": "user", | ||
"password": "pass123", | ||
}, | ||
headers={ | ||
"X-Scope-Org-ID": "5", | ||
"Authorization": "Bearer mytoken123", | ||
}, | ||
proxies={ | ||
"http": "http://10.10.1.10:3000", | ||
"https": "http://10.10.1.10:1080", | ||
}, | ||
tls_config={ | ||
"cert_file": "path/to/file", | ||
"key_file": "path/to/file", | ||
"ca_file": "path_to_file", | ||
"insecure_skip_verify": true, # for developing purposes | ||
} | ||
) | ||
Securing the Exporter | ||
--------------------- | ||
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Authentication | ||
~~~~~~~~~~~~~~ | ||
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The exporter provides two forms of authentication which are shown below. | ||
Users can add their own custom authentication by setting the appropriate | ||
values in the ``headers`` dictionary | ||
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1. Basic Authentication Basic authentication sets a HTTP Authorization | ||
header containing a base64 encoded username/password pair. See `RFC | ||
7617`_ for more information. This | ||
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.. code:: python | ||
exporter = PrometheusRemoteWriteMetricsExporter( | ||
basic_auth={"username": "base64user", "password": "base64pass"} | ||
) | ||
2. Bearer Token Authentication This custom configuration can be achieved | ||
by passing in a custom ``header`` to the constructor. See `RFC 6750`_ | ||
for more information. | ||
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.. code:: python | ||
header = { | ||
"Authorization": "Bearer mytoken123" | ||
} | ||
TLS | ||
~~~ | ||
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Users can add TLS to the exporter's HTTP Client by providing certificate | ||
and key files in the ``tls_config`` parameter. | ||
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Supported Aggregators | ||
--------------------- | ||
Behaviour of these aggregators is outlined in the `OpenTelemetry Specification <https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/api.md#aggregations>`_. | ||
All aggregators are converted into the `timeseries`_ data format. However, method in | ||
which they are converted `differs <https://github.com/open-telemetry/opentelemetry-python-contrib/blob/main/exporter/opentelemetry-exporter-prometheus-remote-write/src/opentelemetry/exporter/prometheus_remote_write/__init__.py#L196>`_ from aggregator to aggregator. A | ||
map of the conversion methods can be found `here <https://github.com/open-telemetry/opentelemetry-python-contrib/blob/main/exporter/opentelemetry-exporter-prometheus-remote-write/src/opentelemetry/exporter/prometheus_remote_write/__init__.py#L75>`_. | ||
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+------------------------------+-------------------------------------+------------------------------------------------------------------------------------------------------------+ | ||
| **OpenTelemetry Aggregator** | **Equivalent Prometheus Data Type** | **Behaviour** | | ||
+------------------------------+-------------------------------------+------------------------------------------------------------------------------------------------------------+ | ||
| Sum | Counter | Metric value can only go up or be reset to 0 | | ||
+------------------------------+-------------------------------------+------------------------------------------------------------------------------------------------------------+ | ||
| MinMaxSumCount | Gauge | Metric value can arbitrarily increment or decrement | | ||
+------------------------------+-------------------------------------+------------------------------------------------------------------------------------------------------------+ | ||
| Histogram | Histogram | Unlike the Prometheus histogram, the OpenTelemetry Histogram does not provide a sum of all observed values | | ||
+------------------------------+-------------------------------------+------------------------------------------------------------------------------------------------------------+ | ||
| LastValue | N/A | Metric only contains the most recently observed value | | ||
+------------------------------+-------------------------------------+------------------------------------------------------------------------------------------------------------+ | ||
| ValueObserver | N/A | Similar to MinMaxSumCount but also contains LastValue | | ||
+------------------------------+-------------------------------------+------------------------------------------------------------------------------------------------------------+ | ||
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Error Handling | ||
-------------- | ||
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In general, errors are raised by the calling function. The exception is | ||
for failed requests where any error status code is logged as a warning | ||
instead. | ||
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This is because the exporter does not implement any retry logic as data that | ||
failed to export will be dropped. | ||
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For example, consider a situation where a user increments a Counter | ||
instrument 5 times and an export happens between each increment. If the | ||
exports happen like so: | ||
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:: | ||
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SUCCESS FAIL FAIL SUCCESS SUCCESS | ||
1 2 3 4 5 | ||
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Then the received data will be: | ||
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:: | ||
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1 4 5 | ||
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Contributing | ||
------------ | ||
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If you would like to learn more about the exporter's structure and | ||
design decisions please view the design document below | ||
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Design Doc | ||
~~~~~~~~~~ | ||
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`Design Document`_ | ||
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This document is stored elsewhere as it contains large images which will | ||
significantly increase the size of this repo. | ||
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.. _Summary: #opentelemetry-python-sdk-prometheus-remote-write-exporter | ||
.. _Table of Contents: #table-of-contents | ||
.. _Installation: #installation | ||
.. _Quickstart: #quickstart | ||
.. _Examples: #examples | ||
.. _Configuring the Exporter: #configuring-the-exporter | ||
.. _Securing the Exporter: #securing-the-exporter | ||
.. _Authentication: #authentication | ||
.. _TLS: #tls | ||
.. _Supported Aggregators: #supported-aggregators | ||
.. _Error Handling: #error-handling | ||
.. _Contributing: #contributing | ||
.. _Design Doc: #design-doc | ||
.. |Prometheus SDK pipelines| image:: https://user-images.githubusercontent.com/20804975/100285430-e320fd80-2f3e-11eb-8217-a562c559153c.png | ||
.. _RFC 7617: https://tools.ietf.org/html/rfc7617 | ||
.. _RFC 6750: https://tools.ietf.org/html/rfc6750 | ||
.. _Design Document: https://github.com/open-o11y/docs/blob/master/python-prometheus-remote-write/design-doc.md | ||
.. _OTLP: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/otlp.md | ||
.. _OpenTelemetry Python SDK: https://github.com/open-telemetry/opentelemetry-python | ||
.. _Prometheus "pull" exporter: https://github.com/open-telemetry/opentelemetry-python/tree/main/exporter/opentelemetry-exporter-prometheus | ||
.. _Prometheus Remote Write integrated backend: https://prometheus.io/docs/operating/integrations/ | ||
.. _types.proto: https://github.com/prometheus/prometheus/blob/master/prompb/types.proto | ||
.. _remote.proto: https://github.com/prometheus/prometheus/blob/master/prompb/remote.proto | ||
.. _push controller: https://github.com/open-telemetry/opentelemetry-python/blob/main/opentelemetry-sdk/src/opentelemetry/sdk/metrics/export/controller.py#L22 | ||
.. _timeseries: https://prometheus.io/docs/concepts/data_model/ | ||
.. _Docker Compose: https://docs.docker.com/compose/ | ||
.. _Cortex: https://cortexmetrics.io/ | ||
.. _Grafana: https://grafana.com/ | ||
.. _installed: https://docs.docker.com/compose/install/ |
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exporter/opentelemetry-exporter-prometheus-remote-write/examples/Dockerfile
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FROM python:3.7 | ||
WORKDIR /code | ||
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COPY . . | ||
RUN apt-get update -y && apt-get install libsnappy-dev -y | ||
RUN pip install -e . | ||
RUN pip install -r ./examples/requirements.txt | ||
CMD ["python", "./examples/sampleapp.py"] |
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