hello guys , I added my helath check endpoints in otel collector yaml file and I'm getting info at every 10 secs . so when I stop the service then I should get slack notification error instantly but it takes around 5 minutes. why is that? and same when service is up I should get resolved slack notification instantly. is it as expected or I'm doing something wrong?

It doesn't take 5 minutes, it would take 2-3 minutes. First, the check runs every minute, i.e. it doesn't immediately know your service health check fails, it knows when the alert is run. Next, the alerts are delayed a bit to avoid the false, which you can adjust by setting

RULES_EVAL_DELAY=0m

RULES_EVAL_DELAY=0m where to put this value?