We have a need to route alerts based on our database/cluster's impacted instead of having them apply to any in the current project. I know some of them can condition based on host name, which uses the cluster name, but most alert types have no similar option.

Examples would be:
Search Index Build Complete
Search Index Build Failed

These are sent without conditions and even the message does not indicate what cluster they are for (although you can guess based on the collection name provided).

We do not have the option to route these ourselves with a webhook, as the relevant information is not provided there either.