Investigate custom health monitor service that wraps up the services that determine if the app should be up

[tpendragon]

What maintenance needs to be done?

We'd like to have a constant URL for pulibrary/princeton_ansible#1421, and think we can accomplish that with a provider that wraps up other providers, and just always filter to that one.

Level of urgency

• High
• Moderate
• Low

Acceptance criteria

• There's a URL that's /health.json?providers[]=uptime that returns a 5xx if the database or cache is down.

Implementation notes, if any

Example of a custom provider: https://github.com/pulibrary/lae-blacklight/pull/384/files

First Step

Figure out how to call a provider from another provider.