fix(Grafana): Metric _pod_requests already include _daemon_requests

[mkilchhofer]

Fixes #7407

Description

The dashboards provided on the website (https://karpenter.sh/docs/getting-started/getting-started-with-karpenter/#monitoring-with-grafana-optional) calculates the used capacity on the Karpenter-managed nodes.
For this, they currently use this forumla:

karpenter_nodes_total_daemon_requests + karpenter_nodes_total_pod_requests
--------------------------------------------------------------------------
        karpenter_nodes_allocatable

This formula is wrong as the metric karpenter_nodes_total_pod_requests already include the requests of the DaemonSet pods according to the metrics documentation:

### `karpenter_nodes_total_pod_requests`
Node total pod requests are the resources requested by pods bound to nodes, including the DaemonSet pods.
- Stability Level: BETA

Source: https://github.com/aws/karpenter-provider-aws/blob/main/website/content/en/docs/reference/metrics.md

How was this change tested?

Importing the old and the new dashboard into our Grafana Cloud instance and compared the results:

Old:

New:

Does this change impact docs?

• Yes, PR includes docs updates
• Yes, issue opened: #
• No

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[mkilchhofer]

I am not sure how far this change goes back, I can only confirm that both 1.9 and 1.8 were affected since we at @swisspost used both versions and both had this behavior.

So I adapted the dashboards for

• /docs/.. (I assume the current version)
• /preview/.. (to also include it in further releases)
• /v1.8/..
• /v1.9/..

There are other dashboard Jsons with the old formula where I am not sure if metrics once were handled different

• /v1.0/..
• /v1.7/..