Vmalert: adjust time
param for datasource queries according to evaluationInterval
#1257
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With this change, vmalert will start to use rule's evaluation interval
for truncating the
time
param. This is mostly needed to produce consistenttime series with timestamps unaffected by vmalert start time. Now, timestamp
becomes predictable.
Additionally, adjustment is similar to what Grafana does for plotting range graphs.
Hence, recording rule series and recording rule expression plotted in grafana
suppose to become similar in most of cases.
#1232