Increase the prometheus scrape interval

[aly-obol]

Grafana cloud billing is based on usage, and usage is determined by two primary factors:

• The number of active series (95th percentile)
• The number of data points per minute (DPM), also at the 95th percentile.

Illustrative Example for Grafana Cloud Pro:

• Scenario A: 50,000 active series at a 60 second scrape interval (that is, 1 DPM) Pricing: 50,000 active series (1 DPM / 1 DPM Included) ($8 / 1000 active series) = $400 / month
• Scenario B: 50,000 active series at a 30 second scrape interval (that is, 2 DPM) Pricing: 50,000 active series (2 DPM / 1 DPM Included) ($8 / 1000 active series) = $800 / month

We have to increase the scrape interval in the prometheus.yml configuration from 12s to 384s (1 epoch) in the following repos: -charon-distributed-validator-node and -charon-distributed-validator-cluster

[corverroos]

I'm happy to decrease the default scrape period to 30s (from 12s, so 2x decrease in data). We can then ask users to decrease it further to 1min (4x decrease in data in total) as part of "Leader Adds Central Monitoring Token"