How do I Add a filter to mstats?

[rolabrie]

Given a query

| mstats sum(ktm.lag_ms_count) as sum_count where index=ktm

I want to restrict the results based on another attribute like this

| mstats sum(ktm.lag_ms_count) as sum_count where index=ktm,ktm.lag_ms_mean > 120000

But this doesn't work. Possible to do this kind of filter in mstats? I've been able to do absolute filters

where index=ktm,cluster=app

But the ranged thing doesn't work

[rolabrie]

Bump. Anyone out there? This shouldn't be hard: influx and prometheus do it easily.