We have been using the SQL expression `name='(*Verifier).Verify' AND
error_name='not enough shares for successful audit'` thus far to detect
cases of this problem and alert on them. Unfortunately, since this
rarely (hopefully never) happens, influxdb has no data for most of the
auditor instances, and when it has no data for a time series, it returns
no columns either. This makes Redash upset when it tries to perform a
query for an alert and can't find the column whose value it expects to
check.
This change should make it so zero values are reported when the problem
has not happened, and higher values when it has.
Change-Id: I79e5e000f879678b661dac88caae1e2915b39ab1
0c8c11b251