Find out the day a deploy hurt LCP, in the channel you already read
Email on free, Slack on paid.
A monthly PageSpeed run is a ritual. A regression happens on a Tuesday deploy. Slack is where that Tuesday already lives. Put the vitals alert there.
What the alert should say
The URL. Which metric moved. The old number and the new number. The day. A link to the chart. Not a score out of 100. Scores hide whether LCP or CLS was the problem.
Thresholds that do not spam
Alert when a URL goes from good to needs-improvement, or when LCP jumps by a large step and stays there on the next run. Do not alert on a single lab blip.
Who should get it
The person who can revert the theme or the app, not a general #random channel. Agencies: one channel per client or a single #vitals channel with the client name in the title.
FAQ
Can I use Teams instead?
Yes, from paid plans that include Slack and Teams. Same idea, different webhook.
Will this replace Search Console?
No. Search Console is still the field record. Slack is how you hear about a lab/field shift early.