Added instructions for lab 18

Author: siddhi

labs/18-observability.md

@@ -0,0 +1,32 @@
+# Lab 18: Observability
+
+In this lab, we will integrate the OpenAI Agents SDK with Braintrust Observability tool
+
+## Sign up for Braintrust
+
+1. Sign up for Braintrust free plan - https://www.braintrust.dev/pricing
+1. You will be asked to create an organisation. Create one in your name
+1. After sign up it will ask if you want to add tracing for an existing application. Select that option and it will show you your API key. Copy it.
+1. Rename the default project to "Prodapt"
+
+## Configure the app
+
+1. To the `.env` file add `BRAINTRUST_API_KEY=...`
+1. Update `config.py` and add the setting `BRAINTRUST_API_KEY: str`
+1. Open `agent.py`
+
+Add these imports
+
+```python
+from agents import set_trace_processors
+from braintrust import init_logger
+from braintrust.wrappers.openai import BraintrustTracingProcessor
+```
+
+The in the `main()` function configure the tracing. (Assuming that the name of the project in Braintrust is "Prodapt")
+
+```python
+set_trace_processors([BraintrustTracingProcessor(init_logger("Prodapt", api_key=settings.BRAINTRUST_API_KEY))])
+```
+
+Run the agents app and see the traces in the UI