Add profiler integration (#14856)

source/_integrations/profiler.markdown

@@ -0,0 +1,35 @@
+---
+title: Profiler
+description: Profile Home Assistant.
+ha_category:
+  - Utility
+ha_release: 0.117
+ha_quality_scale: internal
+ha_domain: profiler
+---
+
+The Profiler integration provides a profile which is a set of statistics that identifies how much time each part of Home Assistant is taking. It can help track down a performance issue or provide insight about a misbehaving integration.
+
+## Configuration
+
+To add `Profiler` to your installation, go to **Configuration** >> **Integrations** in the UI, click the button with `+` sign and from the list of integrations select **Profiler**.
+
+### Service `profiler.start`
+
+Start the profiler for the specified number of seconds.
+
+| Service data attribute | Optional | Description |
+| ---------------------- | -------- | ----------- |
+| `seconds` | yes | The number of seconds to run the profile. Defaults to 60.0
+
+When the profile is complete, Profiler will generate a Python `cprof` and a `callgrind.out` file in your configuration directory. The exact path to these files will appear in a persistent notification so they can be easily located and copied to your desktop. 
+
+The `cprof` file can be viewed with:
+
+[SnakeViz](https://jiffyclub.github.io/snakeviz/)
+[Gprof2dot](https://github.com/jrfonseca/gprof2dot)
+
+Additionally, the profiler will generate a `callgrind.out` file that can be viewed with:
+
+[kcachegrind](https://kcachegrind.github.io/) or qcachegrind
+