Use sysmetic monitor to check GCP's preemption rates

[SHuang-Broad]

GCP's preemption is frustratingly a mystery.

Now that Terra has enabled systematic monitoring, we should generate a report on this, based on a multitude of variables

• resource requests
• time of day
• day of week
• date of month
• month of year (we have stories Black Friday and Cyber Monday is a thing that affects us, 🤢 )
• region

[SHuang-Broad]

tagging @bshifaw @jonn-smith @shadizaheri