[DOC] PG18 Full support (PMM-14517)

[catalinaadam]

PMM-0

Link to the Feature Build: SUBMODULES-0

If this PR adds, removes or alters one or more API endpoints, please review and add or update the relevant API documentation as well:

• API Docs updated

If this PR is related to some other PRs in this or other repositories, please provide links to those PRs:

• Links to related pull requests (optional).

[percona-robot]

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PMM's two production-ready HA options ([Docker](../install-pmm/HA-docker.md) and [Kubernetes single-instance](../install-pmm/HA-kubernetes-single-instance.md)) work well but leave 1-5 minute monitoring gaps during failover.

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PMM's two production-ready HA options ([Docker](../install-pmm/HA-docker.md) and [Kubernetes single-instance](../install-pmm/HA-kubernetes-single-instance.md)) work well but leave 1-5 minute monitoring gaps during failover.

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- **[PMM HA Health Overview dashboard](../reference/dashboards/dashboard-ha-health-overview.md)**: provides detailed monitoring of component health, resource usage, and pod status specifically for HA Clustered deployments

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See [limitations and known issues](../install-pmm/HA-clustered.md#known-issues) for current restrictions.

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For installation instructions, see [Install PMM with Kubernetes HA (Clustered)](../install-pmm/HA-clustered.md).

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For programmatic monitoring, see the new [REST API endpoints](https://percona-pmm.readme.io/reference/release-notes-3-6-0).