The min operator calculates the minimum value of the time series that match the query. If grouping is specified, it calculates the minimum for each group.
min [by FIELD [, FIELD, ...]]
Minimum metric value across all matching time series
This query returns the minimum
cpu_system value for each time interval across all matching time series.
dep=prod metric=cpu_system | min
Minimum metric value across by a tag value
This query returns the minimum cpu_system value by node for each time interval across all matching time series.
cluster=search metric=cpu_idle | min by node