Service dependency between web-pages and api

Overview

On 2022-03-31 we've seen service degradation on the api service and as a result web-pages was also violating the SLO. This is because web-pages depends heavily on api since it uses the API for data.

Proposal

Implement a dependsOn to have web-pages depend on api.

One thing to validate is that api already depends on patroni, so we need to check if dependency chains are supported, meaning if patroni is firing we shouldn't alert on api (we know this works) and also web-pages.