ref(discover2) Test out sampling on tag values (#16387)
ref(discover2) Test out sampling on tag values (#16387)

The facets endpoint is still not fast. I want to see what kind of
results can be obtained if we aggressively sample tag values. If this
yields acceptable performance I want to try scaling the sampling rate
based on the data volume so that we can better balance accurracy and
performance.
beeftornado/sentry,beeftornado/sentry,beeftornado/sentry