Slack notifications for critical server events

[jmensch1]

Description

We should be notified in slack when something important happens on the server, like a crash or critical error.

Action Items

• Hook up slack notifications for critical server events
• Investigate what other info it might be useful to send to slack

Resources

https://devcenter.heroku.com/articles/app-webhooks
https://api.slack.com/messaging/webhooks

Update

I found a service called Uptime Robot that sends periodic requests to backend services to check if they're working. If they're not, it can send a message to a Slack webhook. The free tier lets you ping the server every five minutes, and you can monitor up to 50 apps. Here's their site.
https://uptimerobot.com/. They have a nice dashboard, and I've generally found it very easy to use.

In order to hook this up to Slack, we need to create a Slack app with an incoming webhook. This request has been sent to the ops team. (hackforla/ops#1)