Airgapped documentation is outdated on PostgreSQL 16

[a-velasco]

https://canonical-charmed-postgresql.readthedocs-hosted.com/16/how-to/deploy/air-gapped/

• References edge channels
• uses 14/edge snap for PG 16/stable
• Uses ubuntu-advantage charm (now ubuntu-pro)
• Uses grafana-agent charm (we are told to use opentelemetry-collector now)

[syncronize-issues-to-jira]

Thank you for reporting your feedback to us!

The internal ticket has been created: https://warthogs.atlassian.net/browse/DPE-9677.

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