feat(internals): Add documentation for profiler usage

Author: sakshamarora1

docs/maintenance/internals/profiler.md

@@ -0,0 +1,62 @@
+# Profiler
+
+Invenio App RDM includes a profiler for analyzing Python and SQL performance.
+
+## Features
+
+- Start/stop profiling sessions from a web UI
+- Collects and stores function-level profiling using [pyinstrument](https://github.com/joerick/pyinstrument)
+- Collects and stores SQL query profiling using [sqltap](https://github.com/vinsci/sqltap)
+- Profiling data is saved per-session as SQLite files in the configured storage directory.
+- Generated reports can be viewed (or downloaded) per request for both the Python (base) and SQL layers.
+
+## Installation
+
+The profiler's dependencies are included in the `profiler` extra of `invenio-app-rdm`:
+
+```
+pip install invenio-app-rdm[profiler]
+```
+
+Or, if you are using `setup.cfg`, ensure the following:
+
+```ini
+[options.extras_require]
+profiler =
+    pyinstrument>=5.0.0,<6
+    sqltap>=0.3.11,<1.0.0
+```
+
+## Enabling the profiler
+
+By default, the profiler is **disabled** in production. To enable it, add the following in your `invenio.cfg` or environment:
+
+```python
+APP_RDM_PROFILER_ENABLED = True
+# Optionally restrict profiler to administrators only 
+# See: APP_RDM_PROFILER_PERMISSION in Customization below
+```
+
+## Customization
+
+You may customize profiler behavior by setting Flask config variables:
+
+- `APP_RDM_PROFILER_ENABLED`: `True`/`False` - enable/disable profiler
+- `APP_RDM_PROFILER_STORAGE`: Path object or string, directory for profiler DBs (default: `$INSTANCE_PATH/profiler`)
+- `APP_RDM_PROFILER_ACTIVE_SESSION_LIFETIME`: `timedelta`, how long a session is valid for (default: 60 min)
+- `APP_RDM_PROFILER_ACTIVE_SESSION_REFRESH`: `timedelta`, session activity refresh window (default: 30 min)
+- `APP_RDM_PROFILER_IGNORED_ENDPOINTS`: List of endpoint regexes to ignore (default: `["static", r"profiler\..+"]`)
+- `APP_RDM_PROFILER_PERMISSION`: Callable returning True if current user can access the profiler (default: administrators only)
+
+
+## Usage
+
+With the profiler enabled and required dependencies installed:
+
+1. Visit: `/profiler/` (e.g. http://localhost:5000/profiler/)
+2. Start a profiling session by clicking "Start session", choosing:
+    - an ID for the session,
+    - whether to enable Python profiling,
+    - whether to enable SQL profiling.
+3. Interact with your site as usual. The profiler will collect profile data for each request.
+4. Return to `/profiler/` to view and manage the collected profiling sessions and their reports.

mkdocs.yml

@@ -192,6 +192,7 @@ nav:
           - Building services: maintenance/internals/service.md
           - Building serializers: maintenance/internals/serializers.md
           - Create a database migration: maintenance/internals/alembic.md
+          - Profiler: maintenance/internals/profiler.md
           - Database transaction management: maintenance/internals/transactions.md
           - Grouping atomic operations: maintenance/internals/uow.md
           - Job system: maintenance/internals/jobs.md