Unleash / unleash / 17156770733

86%

master: 91%

Build Type

push

github

Committed by web-flow

Commit Message

feat: support different etags per environment (#10512)

## About the changes
This PR introduces environment-specific etags. This way clients will not
react by updating features when there are changes in environments the
SDK doesn't care about.

## Details
There's a bit of scouting work (please don't make me split this :pray:)
and other details are in comments, but the most relevant for the lazy
ones:
- Important **decision** on how we detect changes, unifying polling and
delta:
https://github.com/Unleash/unleash/pull/10512#discussion_r2285677129
- **Decision** on how we update revision id per environment:
https://github.com/Unleash/unleash/pull/10512#discussion_r2291888401
- and how we do initial fetch on the read path:
https://github.com/Unleash/unleash/pull/10512#discussion_r2291884777
- The singleton pattern that gave me **nightmares**:
https://github.com/Unleash/unleash/pull/10512#discussion_r2291848934
- **Do we still have ALL_ENVS tokens?**
https://github.com/Unleash/unleash/pull/10512#discussion_r2291913249

## Feature flag
To control the rollout introduced `etagByEnv` feature:
[0da567d](https://github.com/Unleash/unleash/pull/10512/commits/0da567dd9)

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