Memory Utilisation widget shows warnings based on memory request value, not limit value

Hello!

The Memory Utilisation and Health widgets show the request value and warn if the memory usage approaches 100%.

However, we've got the following limits set:

```yaml
resources:
requests:
memory: "2Gi"
cpu: "1"
limits:
memory: "12Gi"
```

Should the widget only show warnings if the memory usage approaches the limit of 12Gi and not the request value of 2Gi?

Now it feels things are about to go horribly wrong, while the database can easily request more memory if it needs.

Locate the Memory Utilisation and Health widgets in the Grafana dashboards and inspect how their warning thresholds use Kubernetes memory requests and limits. Confirm the intended threshold against the reported 2Gi request and 12Gi limit; the issue is done when warnings reflect the configured memory limit rather than the request value.

Written by the indexing model from the issue text.