Wow, I really appreciate this. Thanks so much. Op dinsdag 1 februari 2022 om 22:05:36 UTC+1 schreef [email protected]:
> Since rate() is a function, not a metric, you can't pass it to > parser.ParseMetric() and expect it to work. You need to stick to ParseExpr > and walk down the entire AST. > What you need to do is find all instances of parser.VectorSelector, which > is the data structure that hold time series selectors in queries, and > append labels there. > Here's an example: > https://gist.github.com/prymitive/e021f48cda4744de24bce9c4b523c315 > > If you need more example code check > https://github.com/cloudflare/pint/blob/main/cmd/pint/parse.go > On Tuesday, 1 February 2022 at 19:47:16 UTC [email protected] wrote: > >> Hi everyone, >> >> I'm automating a way to modify Grafana Dashboards to our liking. For >> example to use a public Grafana dashboard and append certain query labels >> to every query in a dashboard. >> For this, I figured to use the Prometheus Parser, which works well to >> some extend for my use-case. However certain 'expressions' (or queries) >> don't parse that well (or I'm doing it wrong). >> >> As a quick draft I have the following code: >> ------ >> parsedExpr, _ := parser.ParseExpr(expr) >> childExprs := parser.Children(parsedExpr) >> parsedMainMetric, _ := parser.ParseMetric(expr) >> >> fmt.Println(parsedMainMetric) >> for _, childExpr := range childExprs { >> >> parsedChildExpr, _ := parser.ParseMetric(childExpr.String()) >> fmt.Println(parsedChildExpr) >> } >> ------ >> Which works for: >> >> > input: "rate(node_disk_io_time_seconds_total{bar=\"foo\"}[2m])", >> >> As this gives me the following output: >> >> > {__name__="rate"} >> > {__name__="node_disk_io_time_seconds_total", bar="foo"} >> >> However, lets say I change the input to: >> >> > input: "rate(node_disk_io_time_seconds_total{bar=\"foo\"}[2m]) > 0", >> >> Then it does not exactly go how I expected it to be: >> >> > {__name__="rate"} >> > {__name__="rate"} >> > {} >> >> (obviously this is mainly due to how I wrote my draft code). >> >> I have seen https://demo.promlens.com/?l=eF6PYANAlbQ - and I was >> wondering if someone could give me some pointers on how I should continue >> (and if this is actually a viable option to update labels). >> >> Thanks in advance, >> >> Wiard >> > -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/df6bfdaf-114a-4bd1-8e75-4fe6e658fa7bn%40googlegroups.com.
