hmm, I don't see how this fix for #6283. -httpAuth.password can be hot loaded cause we check it when reloading

But for auth config in datasource, remoteRead, we only init clients once when newManager. So user must restart vmalert process to get latest values. In that case, it can already be achieved by using env which read from secret like

env:
  - name: VM_remoteWrite_basicAuth_username
    valueFrom:
      secretKeyRef:
        name: prometheus-secret
        key: username

And I think #6283 is specifically asks for -httpAuth.username, which can be included by existing check

Thanks, but I'm not sure why to introduce new parameter. And why only for vmalert.

vmalert there is just an example. So what I would love to see that all VictoriaMetrics components will be able to read a file via httpAuth.username. Just like it was done for httpAuth.password in the v1.97.0 announcement I quoted in #6283