[ENHANCEMENT] Relabeling: small speed-up of hashmod
Code optimization: The relabel operation is used very frequently, and strconv.FormatInt() with better performance should be used.
This replaces the custom `moreThanOneRune` function with the standard
`utf8.DecodeRuneInString(s)` that can be used to figure out the size of
the first rune.
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
This adds some more test cases for unicode values, and also a benchmark
for zeroOrOneCharacterStringMatcher.Matches()
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
This can give a more precise result, by keeping a separate running
compensation value to accumulate small errors.
See https://en.wikipedia.org/wiki/Kahan_summation_algorithm
Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
Add method `PostingsForLabelMatching` to `tsdb.IndexReader`, to obtain postings for labels with a certain name and values accepted by a provided callback, and use it from `tsdb.PostingsForMatchers`.
The intention is to optimize regexp matcher paths, especially not having to load all label values before matching on them.
Plus tests, and refactor some `tsdb/index.Reader` methods.
Benchmarking shows memory reduction up to ~100%, and speedup of up to ~50%.
Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>
Co-authored-by: Bartlomiej Plotka <bwplotka@gmail.com>
When the label name of a matcher contains non-standard characters, like
a dot, or starts with a digit, it should be quoted.
If it's not quoted, then `VectorSelector.String()` isn't a valid PromQL.
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
The function `rangeEvalTimestampFunctionOverVectorSelector` appeared to be checking histogram size, however the value it used was always 0 due to subtle variable shadowing.
However we don't need to pass sample values to the `timestamp` function, since the latter only cares about timestamps. This also affects peak sample count in statistics, since we are no longer copying histogram samples.
Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>
Allow users to opt-out of the multi-cluster setup for Prometheus
dashboard, in environments where it isn't applicable.
Refer: https://github.com/prometheus/prometheus/pull/13180.
Signed-off-by: Pranshu Srivastava <rexagod@gmail.com>
When `zeroOrOneCharacterStringMatcher` wach checking the input string,
it assumed that if there are more than one bytes, then there are more
than one runes, but that's not necessarily true.
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
The check fell into "this matcher equals vector selector's name" case when vector selector doesn't have a name and the matcher is an explicit matcher for an empty __name__ label.
To provide some context about why this is important: some downstream projects use the promql.Parse(expr.String()) to clone an expression's AST, and with this bug that matcher disappears in the cloning.
Signed-off-by: Oleg Zaytsev <mail@olegzaytsev.com>
* bugfix: Add missing comma when encoding JSON results in web API
---------
Signed-off-by: Amir Vejahat <amir.vejahat.av@gmail.com>
Co-authored-by: Arthur Silva Sens <arthur.sens@coralogix.com>
* BUGFIX: Mark the rule's restoration process as completed always
In https://github.com/prometheus/prometheus/pull/13980 I introduced a change to reduce the number of queries executed when we restore alert statuses.
With this, the querying semantics changed as we now need to go through all series before we enter the alert restoration loop and I missed the fact that exiting early when there are no rules to restore would lead to an incomplete restoration.
An alert being restored is used as a proxy for "we're now ready to write `ALERTS/ALERTS_FOR_SERIES` metrics" so as a result we weren't writing the series if we didn't restore anything the first time around.
---------
Signed-off-by: gotjosh <josue.abreu@gmail.com>
