Major upgrades need to follow upgrade-notes

[tiina303]

Creating an issue as docs are moving to posthog.com, so I don't want to change it twice.

Add some bigger bolder signs around how users should verify that they are doing a major upgrade or not (ideally a single shell cmd) & if so direct them to upgrade notes

helm list

shows the chart version
we can check the tags to see where the chart is at https://github.com/PostHog/charts-clickhouse/tags

[tiina303]

Related to docs: make email & sentry setup more high profile

[macobo]

Related: We're using github releases but they don't currently contain any information on the release. That would be a good place to communicate these issues as well.

See also helm/chart-releaser#118

[tiina303]

Idea: we can make helm fail major upgrades preemptively (similarly to the right file used verification) if they don't provide a value majorUpgrade=true e.g. --set majorUpgrade=true at the end of the upgrade command & link folks to the upgrade notes

[tiina303]

@guidoiaquinti related to you working on the chart, what do you think of the idea above & would you want to add that to the list of chart improvements you're working on this sprint?

[guidoiaquinti]

Unfortunately I don't think I'll have time this sprint