Rolling out a feature safely across dozens of services? You’ll need more than a
if (enabled) check.We used LaunchDarkly and later togglz to gate feature access based on:
- Service version
- Region or data center
- Random sampling
Tip: avoid coupling flags with code logic too tightly. Flags are transient — your code isn’t.
And always have a kill switch path. Fail open or closed — never undefined.