Metrics and Statisitcs

[DarthMax]

Provide a API to access Æternitas' metrics

Metrics stored in redis

Grouped by pollable class

• job execution count
• failed job count, failure_ratio
• ignored errors
• deactivations
• execution time
• guard
• waited
• guard wait sleep
• guard timeout exceeded

Data statistics

• number of sources (per pollable class)
• pollables created (per pollable class)
• future pollings (per pollable class)

[tamaloa]

To avoid an ever growing Redis instance we will expire metric values/counters as following:

resolution	expire after
minute	3 days
10 minute	14 days
hour	2 months
day	never

After implementing please gather metrics for a 2 months duration for a single pollable class assuming it's job runs once every second (including all kinds of failure states) to get a worst case baseline for the memory and storage requirements of Redis.