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* fix(promql): histogram_quantile NaN observed in native histogram
Fixes: #16578
See the issue for detailed explanation.
When a histogram had only NaN observations and no normal observations,
we returned 0 from the quantile, which is completely wrong. If there were
normal observations but we went over them, we returned the upper bound of
the existing buckets, however that contradicts expectations on
histogram_fraction. Now we return NaN if the quantile is calculated to be
over all normal observations, falling into NaNs (in a virtual +Inf bucket).
We also return info level annotations if we see any NaN observations.
The annotation calls out if we returned NaN or even if we took the
virtual +Inf bucket into account.
Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com>
* fix(promql): histogram_fraction NaN observed in native histogram
Fixes: #16580
According to the specification we should not take NaN observations
into account when calculating the fraction. This commit fixes that
and adds an info level annotation to let the user know about this.
Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com>
This PR fixes a bug in ts_of_last_over_time where the float samples
where used when computing the last timestamp of the histogram samples.
Signed-off-by: Michael Hoffmann <mhoffmann@cloudflare.com>
This commit adds the ts_of_(max,min,last)_over_time functions behind the experimental feature flag.
Signed-off-by: Michael Hoffmann <mhoffmann@cloudflare.com>
As it turns out, if we combine Kahan summation and incremental mean
calculation properly, it works quite well and we do not need to switch
between simple mean calculation and incremental calculation based on
overflow.
This simplifies the code quite a bit.
Signed-off-by: beorn7 <beorn@grafana.com>
* promql: histogram_fraction for bucket histograms
This PR extends the histogram_fraction function to also work with classic bucket histograms. This is beneficial because it allows expressions like sum(increase(my_bucket{le="0.5"}[10m]))/sum(increase(my_total[10m])) to be written without knowing the actual values of the "le" label, easing the transition to native histograms later on.
It also feels natural since histogram_quantile also can deal with classic histograms.
Signed-off-by: Michael Hoffmann <mhoffmann@cloudflare.com>
* promql: histogram_fraction for bucket histograms
* Add documentation and reduce code duplication
* Fix a bug in linear interpolation between bucket boundaries
* Add more PromQL tests
Signed-off-by: Michael Hoffmann <mhoffmann@cloudflare.com>
* Update docs/querying/functions.md
Co-authored-by: Björn Rabenstein <github@rabenste.in>
Signed-off-by: Michael Hoffmann <mhoffm@posteo.de>
---------
Signed-off-by: Michael Hoffmann <mhoffmann@cloudflare.com>
Signed-off-by: Michael Hoffmann <mhoffm@posteo.de>
Co-authored-by: Björn Rabenstein <github@rabenste.in>
promql: return NaN from `irate()` if either of last two samples is NaN
Signed-off-by: Charles Korn <charles.korn@grafana.com>
---------
Signed-off-by: Charles Korn <charles.korn@grafana.com>
Fix duplicate output vector if delayed name removal is disabled
This error is emitted in cleanupMetricLabels, but is skipped if
enableDelayedNameRemoval is false.
This makes it consistent with label_replace
Signed-off-by: Joshua Hesketh <josh@nitrotech.org>
---------
Signed-off-by: Joshua Hesketh <josh@nitrotech.org>
Signed-off-by: Björn Rabenstein <github@rabenste.in>
Co-authored-by: Björn Rabenstein <github@rabenste.in>
If a rate (or increase) is calculated on native histograms, and there
is a counter reset between the 1st and 2nd histogram, we never have to
touch the 1st histogram, so it doesn't even matter if it has an
incompatible bucket layout. So we should not error out in that case.
This simply nulls out the 1st histogram in that case.
Signed-off-by: beorn7 <beorn@grafana.com>
Ensure metric name is present on histogram_quantile annotations
Previously the series __name__ label was dropped before the annotation
was emitted causing the annotation message to have a blank value.
This fix also allows delayed name removal for classic histograms.
This also adds a test for malformed le label
This annotation could be split into two to be clearer for the user
(one for missing, and one for malformed). This is outside of the scope
of this change.
Fixes: #15411
---------
Signed-off-by: Joshua Hesketh <josh@nitrotech.org>
Signed-off-by: Björn Rabenstein <github@rabenste.in>
Co-authored-by: Björn Rabenstein <github@rabenste.in>
`funcDoubleExponentialSmoothing` did not get its doc comment updated
when we renamed it from the confusing `funcHoltWinters`.
Signed-off-by: beorn7 <beorn@grafana.com>
Export quantile functions
For use in Mimir's query engine, it would be helpful if these
functions were exported.
Co-authored-by: Björn Rabenstein <github@rabenste.in>
Signed-off-by: Joshua Hesketh <josh@hesketh.net.au>
---------
Signed-off-by: Joshua Hesketh <josh@nitrotech.org>
Signed-off-by: Joshua Hesketh <josh@hesketh.net.au>
Co-authored-by: Björn Rabenstein <github@rabenste.in>
The `info` function is an experiment to improve UX
around including labels from info metrics.
`info` has to be enabled via the feature flag `--enable-feature=promql-experimental-functions`.
This MVP of info simplifies the implementation by assuming:
* Only support for the target_info metric
* That target_info's identifying labels are job and instance
Also:
* Encode info samples' original timestamp as sample value
* Deduce info series select hints from top-most VectorSelector
---------
Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>
Co-authored-by: Ying WANG <ying.wang@grafana.com>
Co-authored-by: Augustin Husson <augustin.husson@amadeus.com>
Co-authored-by: Bartlomiej Plotka <bwplotka@gmail.com>
Co-authored-by: Björn Rabenstein <github@rabenste.in>
Co-authored-by: Bryan Boreham <bjboreham@gmail.com>
These functions operate on whole series, not on samples, so they do not
fit into the table of functions that return a Vector. Remove the stub
entries that were left to help downstream users of the code identify
what changed.
We cannot remove the entries from the `FunctionCalls` map without
breaking `TestFunctionList`, so put some nils in to keep it happy.
Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
Go's sorting functions can re-order equal elements, so the strategy of
sorting by the fallback ordering first does not always work.
Pulling the fallback into the main comparison function is more reliable
and more efficient.
Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
Shortcut for `.*` matches newlines as well.
Add preamble change ^(?s:
Add test
dotAll flag por al regex
Add and fix regex tests
Signed-off-by: Mario Fernandez <mariofer@redhat.com>
PromQL engine: Delay deletion of __name__ label to the end of the query evaluation
- This change allows optionally preserving the `__name__` label via the `label_replace` and `label_join` functions, and helps prevent the dreaded "vector cannot contain metrics with the same labelset" error.
- The implementation extends the `Series` and `Sample` structs with a boolean flag indicating whether the `__name__` label should be deleted at the end of the query evaluation.
- The `label_replace` and `label_join` functions can still access the value of the `__name__` label, even if it has been previously marked for deletion. If `__name__` is used as target label, it won't be dropped at the end of the query evaluation.
- Fixes https://github.com/prometheus/prometheus/issues/11397
- See https://github.com/jcreixell/prometheus/pull/2 for previous discussion, including the decision to create this PR and benchmark it before considering other alternatives (like refactoring `labels.Labels`).
- See https://github.com/jcreixell/prometheus/pull/1 for an alternative implementation using a special label instead of boolean flags.
- Note: a feature flag `promql-delayed-name-removal` has been added as it changes the behavior of some "weird" queries (see https://github.com/prometheus/prometheus/issues/11397#issuecomment-1451998792)
Example (this always fails, as `__name__` is being dropped by `count_over_time`):
```
count_over_time({__name__!=""}[1m])
=> Error executing query: vector cannot contain metrics with the same labelset
```
Before:
```
label_replace(count_over_time({__name__!=""}[1m]), "__name__", "count_$1", "__name__", "(.+)")
=> Error executing query: vector cannot contain metrics with the same labelset
```
After:
```
label_replace(count_over_time({__name__!=""}[1m]), "__name__", "count_$1", "__name__", "(.+)")
=>
count_go_gc_cycles_automatic_gc_cycles_total{instance="localhost:9090", job="prometheus"} 1
count_go_gc_cycles_forced_gc_cycles_total{instance="localhost:9090", job="prometheus"} 1
...
```
Signed-off-by: Jorge Creixell <jcreixell@gmail.com>
---------
Signed-off-by: Jorge Creixell <jcreixell@gmail.com>
Signed-off-by: Björn Rabenstein <github@rabenste.in>
George Krajcsovits
🌲 Harry 🌊 John 🏔
Michael Hoffmann
beorn7
Bartlomiej Plotka
Neeraj Gartia
Charles Korn
Aman
Michael Hoffmann
Charles Korn
Matthieu MOREL
Joshua Hesketh
Neeraj Gartia
Bryan Boreham
Ben Ye
Jan Fajerski
Arve Knudsen
Mario Fernandez
Jorge Creixell