Enable multiple Alertmanagers under "alertmanagersConfig"

[l4pg]

I currently have my thanos ruler connected to an Alertmanager running in my own cluster, same namespace and all. This was successfully configured under alertmanagers just listing the endpoint and it worked fine.

I now need to add a second Alertmanager to push alerts to but this second one runs in a different cluster and requires basic auth. So just adding that endpoint to my existing alertmanagers list didn't work as I wasn't able to pass the creds to it.

I followed the documentation and used alertmanagersConfigto have the details configured as required but I wasn't able to make it work as expected - although I'm able to template the alertmanagers_config.yml successfully as a secret the thanos ruler pods just don't seem to take that config file successfully at all - I suspect I'm getting some detail incorrect in my specific use case but I wasn't able to find any similar example so hopefully folks here could point me to the proper config. My alertmanagersConfig block looks like this:

        alertmanagersConfig:
          alertmanagers:
            - static_configs:
                - targets:
                  - alertmanager.requiring.basic.auth
              http_config:
                tls_config:
                  insecure_skip_verify: true
              scheme: https
              api_version: v2
            - static_configs:
                - targets:
                  - dnssrv+_web._tcp.alertmanager.local.am
              scheme: http
              api_version: v2

Is anyone configuring alertmanagersConfig successfully? If you could kindly share some examples I would be very grateful.