staging: Monitor svix.internal.staging

Related to swh/infra/sysadm-environment#5105 (closed)

When I check the URL used by svix application in the test cluster with curl, I noticed that this URL is redirected:

~ ᐅ grep url .config/svix/config.toml                                   
server_url = "https://svix-test.internal.staging.swh.network"
~ ᐅ curl -sI https://svix-test.internal.staging.swh.network | awk 'NR==1'
HTTP/2 307 
~ ᐅ curl -sI https://svix-test.internal.staging.swh.network/docs | awk 'NR==1'
HTTP/2 200

The blackbox exporter module is called http_2xxso I use the \docs URL which returns a 200 status code.