docs(srv): add serverless + cockpit troubleshooting MTA-6071 (#5078)

* docs(srv): add serverless + cockpit troubleshooting MTA-6071

* Update macros/cockpit/no-data-grafana-dashboards.mdx

Co-authored-by: ldecarvalho-doc <82805470+ldecarvalho-doc@users.noreply.github.com>

---------

Co-authored-by: ldecarvalho-doc <82805470+ldecarvalho-doc@users.noreply.github.com>

Author: SamyOubouaziz

macros/cockpit/no-data-grafana-dashboards.mdx

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+---
+macro: troubleshooting-no-data-grafana-dashboards
+---
+
+## Problem
+
+I am experiencing one of the following issues:
+
+- I am missing data on my Grafana dashboards
+- A `No data` message displays
+- An error banner stating `Failed to upgrade legacy queries datasource was not found` displays
+- My Cockpit is unavailable.
+- I cannot view my logs and/or metrics in Grafana.
+- I cannot view my dashboards in Grafana.
+
+## Cause
+
+These issues often occur due to synchronization failures between Cockpit and Grafana, preventing dashboards from displaying the latest logs and metrics as expected.
+
+## Solution
+
+Refer to the [dedicated troubleshooting documentation](/cockpit/troubleshooting/synchronize-grafana-data-sources/) on how to synchronize Grafana sources.

pages/serverless-containers/troubleshooting/no-data-grafana-dashboards.mdx

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+---
+meta:
+  title: No data showing up on Grafana dashboards
+  description: Fix Grafana data synchronization issues and ensure data appears on Cockpit dashboards with this troubleshooting guide.
+content:
+  h1: No data showing up on Grafana dashboards
+  paragraph: Fix Grafana data synchronization issues and ensure data appears on Cockpit dashboards with this troubleshooting guide.
+tags: no-data-sources no-data cockpit-unavailable dashboard datasource-not-found missing-data cannot-view access-cockpit
+dates:
+  validation: 2025-06-05
+  posted: 2025-06-05
+categories:
+  - observability
+---
+
+<Macro id="troubleshooting-no-data-grafana-dashboards" />

pages/serverless-functions/troubleshooting/no-data-grafana-dashboards.mdx

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+---
+meta:
+  title: No data showing up on Grafana dashboards
+  description: Fix Grafana data synchronization issues and ensure data appears on Cockpit dashboards with this troubleshooting guide.
+content:
+  h1: No data showing up on Grafana dashboards
+  paragraph: Fix Grafana data synchronization issues and ensure data appears on Cockpit dashboards with this troubleshooting guide.
+tags: no-data-sources no-data cockpit-unavailable dashboard datasource-not-found missing-data cannot-view access-cockpit
+dates:
+  validation: 2025-06-05
+  posted: 2025-06-05
+categories:
+  - observability
+---
+
+<Macro id="troubleshooting-no-data-grafana-dashboards" />

pages/serverless-jobs/troubleshooting/no-data-grafana-dashboards.mdx

@@ -0,0 +1,16 @@
+---
+meta:
+  title: No data showing up on Grafana dashboards
+  description: Fix Grafana data synchronization issues and ensure data appears on Cockpit dashboards with this troubleshooting guide.
+content:
+  h1: No data showing up on Grafana dashboards
+  paragraph: Fix Grafana data synchronization issues and ensure data appears on Cockpit dashboards with this troubleshooting guide.
+tags: no-data-sources no-data cockpit-unavailable dashboard datasource-not-found missing-data cannot-view access-cockpit
+dates:
+  validation: 2025-06-05
+  posted: 2025-06-05
+categories:
+  - observability
+---
+
+<Macro id="troubleshooting-no-data-grafana-dashboards" />