Added support for asap-planner-rs to infer query repetitions and config from Prometheus query log

[milindsrivastava1997]

Earlier, the user had to supply a configuration to asap-planner-rs which had a list of PromQL queries and their frequency of repetition. To make ASAPQuery easier to use, this PR modifies asap-planner-rs to infer queries and their repetition intervals from a Prometheus query log (https://prometheus.io/docs/guides/query-log/)

[zzylol]

What if the query log shows variable query intervals and frequencies of a query expression, what will be the precompute decision?

[milindsrivastava1997]

What if the query log shows variable query intervals and frequencies of a query expression, what will be the precompute decision?

Good question @zzylol . Right now, it takes the median of query inter-arrival times so it will depend on the exact inter-arrival times. It will NOT try to derive multiple frequency repetitions.

I think for such a case, we can add a warning if the inter-arrival times are very different from each other. I don't think we need to support that case right now?

[zzylol]

What if the query log shows variable query intervals and frequencies of a query expression, what will be the precompute decision?

Good question @zzylol . Right now, it takes the median of query inter-arrival times so it will depend on the exact inter-arrival times. It will NOT try to derive multiple frequency repetitions.

I think for such a case, we can add a warning if the inter-arrival times are very different from each other. I don't think we need to support that case right now?

makes sense.