Quick answer: Roll out to a small canary slice first, watch its metrics, and proceed only if healthy, so a bad deploy is caught while it affects few players.
Deploying to everyone at once turns a bug into a global outage. Canary releases contain it. Here is how.
How to fix it
1. Release to a canary
Send a small slice of traffic to the new version first.
2. Watch canary metrics
Compare the canary's error and latency metrics against the stable version.
3. Promote or roll back
Proceed only if the canary is healthy; otherwise roll back before it reaches everyone.
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 backend 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.
The bug you can't reproduce isn't gone — it's just invisible until you capture it from the player's device.