The Google Cloud Monitoring documentation says container/cpu/core_usage_time is:
Cumulative CPU usage on all cores used by the container in seconds. Sampled every 60 seconds.
This description says the CPU usage is sampled every minute but it doesn't say the window of time over which the cumulative CPU usage is measured.
Is this the number of seconds the CPU cores were active over the last minute? That is, if the value of this metric is 150, does that mean the CPU utilization is 2.5 cores (2500 millicores)?