Description of problem:

When I have a host registered with content source set to some capsule and I sync capsule content, the content gets synced but the task fails with:

ERF12-0457 [ProxyAPI::ProxyException]: Unable to update hosts ([RestClient::NotFound]: 404 Not Found) for Capsule https://<CAPSULE_FQDN>:9090/container_gateway/update_hosts 

The host is REXable and I wasn't able to find anything interesting in proxy log.

How reproducible:

Deterministic

Is this issue a regression from an earlier version:

Yes. Can't reproduce on Sat/Cap 6.17 but can reproduce on Sat/Cap stream.

It may, or may not, have something to do with Content View Environments.

Steps to Reproduce:

1. Have a Satellite, have a Capsule, have some content, have a host consuming that content registered to the Satellite with content source set to that Capsule

2. In WebUI: Infrastructure -> Capsules -> <select capsule> -> Sync

3. Go to Monitoring -> Satellite Tasks -> Tasks and open the corresponding task

Actual behavior:
The content seems to be synced but the task failed with the abovementioned message

Expected behavior:
I don't know what "update hosts" means in this context but additionally to syncing content, it probably should also happen and succeed