add icinga check for graph-navigation API endpoints
We should add a check that uses one of our endpoint usage examples (e.g., https://archive.softwareheritage.org/api/1/content/adc83b19e793491b1c6ea0fd8b46cd9f32e592fc/ ) and verifies it returns meaningful data fetched from the DB (e.g., one of its //other// checksums, like 01ba4719c80b6fe911b091a7c05124b64eeece964e09c058ef8f9805daca546b).
Caveat: as we stand, icinga is going to hit the rate limit, so we need to first whitelist the IP icinga is coming from (or all local IPs, maybe).
Migrated from T670 (view on Phabricator)