[Feature Request] Add support for multiple data series

[maplewf]

Hi,

I found that this data source only support single and table panel, I'm now trying to count alert numbers for different severity level in one panel, the status panel seems feasible for that, but it can't be archived by using current alertmanager datasource. I guess it's because current datasource only support single data serial, is it possible to implement to support multiple data series for query? thanks in advance.

best regards.