Upgrade Guide for Terrajet-based Providers

[ulucinar]

What problem are you facing?

Currently we only generate one version of a given resource with Terrajet as discussed in #212. We had better clarify the current upgrade approach without multiple versions.

How could Terrajet help solve your problem?

Should we plan for an upgrade guide for Terrajet-based providers?

[muvaf]

The ones with non-breaking API changes would be solved with #212 I believe, which are most of them. But I expect to have more breaking changes the more we add manual configurations with external name config which may remove a field from spec, so, probably that would be the scenario where this would be most useful.

[stale]

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