Update fixing-common-issues.mdx

Add troubleshooting section for tokens consumption not displayed in Cockpit.

Author: fpagny

pages/generative-apis/troubleshooting/fixing-common-issues.mdx

@@ -69,6 +69,24 @@ Below are common issues that you may encounter when using Generative APIs, their
 }
 ```
 
+## Tokens consumption is not displayed in Cockpit Metrics
+
+### Causes
+- Cockpit are isolated by `project_id` and only display tokens consumption related to one project.
+- Cockpit `Tokens Processed` graphs along time can take up to an hour to update (to provide more accurate average consumptions over time). Note that the overall `Tokens Processed` counter is updated in real time.
+
+### Solution
+- Ensure you are connecting to the right Cockpit for your project. Cockpits are currently isolated by `project_id`, that you can see in their url: `https://{PROJECT_ID}.dashboard.obs.fr-par.scw.cloud/`. This project should correspond to the one used in the URL you used to perform Generative APIs requests, such as `https://api.scaleway.ai/{PROJECT_ID}/v1/chat/completions`. You can list your projects and their ids in your [Organization Dashboard](https://console.scaleway.com/organization/projects).
+
+#### Example error behaviour
+- When displaying the wrong Cockpit for the project:
+  - Counter for Tokens Processed or API Requests should display a value of 0
+  - Graph across time should be empty
+- When displaying the right Cockpit for the project, but waiting for average tokens consumption to display:
+  - Counter for Tokens Processed or API Requests should display a correct value (different from 0)
+  - Graph across time should be empty
+```
+
 ## Best practices for optimizing model performance
 
 ### Input size management