Quick answer: Keep previous build artifacts retained and immutable so you can re-point the live channel at the last known-good build instantly while you fix forward.
When a release is on fire, you want a button, not a rebuild. Retained immutable artifacts give you that button. Here is how to set it up.
How to fix it
1. Retain prior artifacts
Keep recent release builds stored and immutable so a known-good version is always one promotion away.
2. Make releases a pointer
Have the live channel point at a build ID so rolling back is re-pointing it, not rebuilding.
3. Practice the rollback
Rehearse the rollback path so that under pressure it is a known, fast procedure rather than an improvisation.
Catching the ones you can't reproduce
The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.
Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.
This is where a tool like Bugnet earns its place. Its SDK captures every error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.
Ship the fix, watch the signature disappear from the next build. That's how you know it's really gone.