docs(monitoring): add Opik monitoring integration guide

docs/tutorials/integrations/monitoring/opik.md

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+---
+sidebar_position: 21
+title: "Opik"
+---
+
+## Comet Opik Integration with Open WebUI
+
+[Comet Opik](https://www.comet.com/site/products/opik/) is an open-source LLM observability and evaluation platform. You can connect Open WebUI telemetry to Opik using OpenTelemetry-compatible pipelines.
+
+## How to integrate Opik with Open WebUI
+
+[Pipelines](https://github.com/open-webui/pipelines/) in Open WebUI are an UI-agnostic framework for OpenAI API plugins. They can intercept and forward requests while exporting telemetry.
+
+To use Opik, configure your telemetry pipeline to export traces to your Opik OTLP endpoint and headers from your project settings.
+
+## Quick Start Guide
+
+### Step 1: Setup Open WebUI
+
+Make sure Open WebUI is running. See the [Open WebUI documentation](https://docs.openwebui.com/).
+
+### Step 2: Set Up Pipelines
+
+Start Pipelines:
+
+```bash
+docker run -p 9099:9099 --add-host=host.docker.internal:host-gateway -v pipelines:/app/pipelines --name pipelines --restart always ghcr.io/open-webui/pipelines:main
+```
+
+### Step 3: Configure OpenTelemetry export for Opik
+
+In your telemetry pipeline configuration, set:
+
+- `OTEL_EXPORTER_OTLP_ENDPOINT=<opik_otlp_endpoint>`
+- `OTEL_EXPORTER_OTLP_HEADERS=<opik_otlp_headers>`
+
+Use the values from your Opik project settings.
+
+### Step 4: Verify traces in Opik
+
+Run Open WebUI traffic through your pipeline and confirm traces appear in your Opik project.
+
+## Learn more
+
+- [Comet Opik docs](https://www.comet.com/docs/opik/)
+- [Open WebUI Pipelines](https://github.com/open-webui/pipelines/)