Rules are complex, and we want aggregation and real-time computation rules to support logical operations

[wego-xuchang]

Proposal

Rules are complex, and we want aggregation and real-time computation rules to support logical operations

I hope the rule engine is officially supported
Or just use a lua script, which is great

[beorn7]

Not sure what you are up to here. Could you be more specific?

Not the following:

• Prometheus supports recording rules: https://prometheus.io/docs/prometheus/latest/configuration/recording_rules/
• PromQL supports logical operations: https://prometheus.io/docs/prometheus/latest/querying/operators/
• Adding scripting language support was prototyped in Add User Defined Functions to PromQL #12851 and discussed multiple times at dev-summits, with the result so far that we are hesitant to support a scripting language engine for now.

[wego-xuchang]

Not sure what you are up to here. Could you be more specific?

Not the following:

• Prometheus supports recording rules: https://prometheus.io/docs/prometheus/latest/configuration/recording_rules/
• PromQL supports logical operations: https://prometheus.io/docs/prometheus/latest/querying/operators/
• Adding scripting language support was prototyped in Add User Defined Functions to PromQL #12851 and discussed multiple times at dev-summits, with the result so far that we are hesitant to support a scripting language engine for now.

We want the logical operation to refer to if... else or support for scripting language engines can complement this if...else problem.

[beorn7]

PromQL is not an imperative language. It's more like a functional language. The or operator gives you something like "if/else", quoting the documentation: "vector1 or vector2 results in a vector that contains all original elements (label sets + values) of vector1 and additionally all elements of vector2 which do not have matching label sets in vector1."

[wego-xuchang]

PromQL is not an imperative language. It's more like a functional language. The or operator gives you something like "if/else", quoting the documentation: "vector1 or vector2 results in a vector that contains all original elements (label sets + values) of vector1 and additionally all elements of vector2 which do not have matching label sets in vector1."

But how do we solve a similar problem

[beorn7]

I'll convert this into a discussion. If you describe your problem in more detail, perhaps some people can help you in the discussion.

The feature request for an embedded scripting language is valid, of course, but we discussed it at one of the recent dev-summits and decided to not pursue it for now. We left #12851 open, though, as a reminder where to pick it up, should we reconsider.