Instrument backend to detect if the system is down and alert on Slack if so

[grymmy]

Description

Send telemetry from one or more backend services to fullstory such that we can detect situations where the backend is experiencing instability or downtime, preferably via some sort of slack msg/alert. @maxwofford has referred me to relevant documentation on how to send custom events & hook up fullstory / Slack integration.

Screenshots

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Additional information

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[grymmy]

At minimum we should instrument:

1. Enough signals to detect that the overall system is functioning as expected (submissions are being responded to w/ a reasonable distribution of correct/invalid/error results)
2. A signal that records the amount of time each tweet submission takes to be responded to