Module 14 Summary

What this module established

Every environment difference is a setting read from the environment, not a branch in the code - the branch is right everywhere except the place somebody forgot.

Carry forward

• Multiple workers means multiple copies of anything in memory. Test with the worker count you deploy with, or these bugs stay hidden.
• Separate liveness from readiness. A failing dependency should remove an instance from rotation, not restart it.
• Log identifiers, timings, statuses and versions; never bodies, outputs or credentials.

Before moving on

Move on when nothing branches on an environment name, shared state lives outside the process, and no request content reaches your logs.

Mark complete