Can I get lag for all or several consumers rather than one consumer at a time?

Nobody has claimed this yet.

When I have dozens of consumer groups that I want to check for lag, I have to make dozens of calls to `consumer/CONSUMER-GROUP-NAME/lag`. Do you know of any way to get Burrow to give me lag from many consumer groups, rather than one at a time?

Assuming not, would you consider making a GET `consumer/lag` API call that will return the lag for all consumer groups? Alternatively, I could explicitly specify the consumers I want in a POST (perhaps sending in an array of strings in the body), which would be a little more complicated but reasonable.

I'd love to get it all in one call and then output parts of it to get the whole picture of all lag.

Start by tracing the existing consumer/CONSUMER-GROUP-NAME/lag API entry point and how it selects a consumer group. Determine how a request for multiple or all groups should be represented and returned, then verify that one call provides lag for the requested groups without changing the existing endpoint behavior.

Written by the indexing model from the issue text.