[Clarification] What is prewarm actually doing? about serverless-plugin-warmup HOT 1 CLOSED

Prewarm simply invokes your warmers right after the deployment.
This means that all your lambdas that have a warmer setup will be invoke (1 or more times based on the concurrency setting).
This is good to avoid cold start right after deploying.

Also, if at any point in time you want to call the warmers you can use the prewarm option of the cli.

# Either invoking all warmers
serverless warmup prewarm
# some specific one
serverless warmup prewarm -warmers <warmer_name>
# some several
serverless warmup prewarm -warmers <warmer_name>,<another_warmer_name>

If you only need the warmers to run based on your schedule, you don't need prewarm.

from serverless-plugin-warmup.