The calculation of the mean value in avg_over_time is performed in an
incremental fashion. This introduces additional numerical errors that
even Kahan summation cannot compensate, but at least we can use the
Kahan-corrected mean value when we use the intermediate mean value in
the calculation.
Signed-off-by: beorn7 <beorn@grafana.com>
The basic idea here is that the previous code was always doing
incremental calculation of the mean value, which is more costly and
can be less precise. It protects against overflows, but in most cases,
an overflow doesn't happen anyway.
The other idea applied here is to expand on #14074, where Kahan
summation was applied to sum().
With this commit, the average is calculated in a conventional way
(adding everything up and divide in the end) as long as the sum isn't
overflowing float64. This is combined with Kahan summation so that the
avg aggregation, in most cases, is really equivalent to the sum
aggregation with a following division (which is the user's expectation
as avg is supposed to be syntactic sugar for sum with a following
divison).
If the sum hits ±Inf, the calculation reverts to incremental
calculation of the mean value. Kahan summation is also applied here,
although it cannot fully compensate for the numerical errors
introduced by the incremental mean calculation. (The tests added in
this commit would fail if incremental mean calculation was always
used.)
Signed-off-by: beorn7 <beorn@grafana.com>
For example `foo.*|bar.*|baz.*`. Instead of checking each one in turn,
we build a map of prefixes, then check the smaller set that could match
the string supplied.
Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
* Improve testing and readability
Address review comments on #13843
Signed-off-by: Marco Pracucci <marco@pracucci.com>
Instead of carrying around extra fields in `Meta` structs which let us
approximate what was in the chunk at the time, take a copy of the chunk.
This simplifies lots of code, and lets us correct a couple of tests which
were embedding the wrong answer.
We can also remove boundedIterator, which was only used to constrain
the OOO head chunk.
Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
* feat: add support for gathering flavor name in Openstack discovery
Signed-off-by: Paulo Dias <paulodias.gm@gmail.com>
* Update instance.go
Co-authored-by: Ayoub Mrini <ayoubmrini424@gmail.com>
Signed-off-by: Paulo Dias <44772900+paulojmdias@users.noreply.github.com>
* Update configuration.md
Co-authored-by: Ayoub Mrini <ayoubmrini424@gmail.com>
Signed-off-by: Paulo Dias <44772900+paulojmdias@users.noreply.github.com>
* fix: fix linting
Signed-off-by: Paulo Dias <paulodias.gm@gmail.com>
* fix: fix instance type
Signed-off-by: Paulo Dias <paulodias.gm@gmail.com>
* Update docs/configuration/configuration.md
Co-authored-by: Simon Pasquier <spasquie@redhat.com>
Signed-off-by: Paulo Dias <44772900+paulojmdias@users.noreply.github.com>
---------
Signed-off-by: Paulo Dias <paulodias.gm@gmail.com>
Signed-off-by: Paulo Dias <44772900+paulojmdias@users.noreply.github.com>
Co-authored-by: Ayoub Mrini <ayoubmrini424@gmail.com>
Co-authored-by: Simon Pasquier <spasquie@redhat.com>
* fix(docs/querying): explain `ceil` behaviour more explicitly with examples
Signed-off-by: Rick Rackow <rick.rackow@gmail.com>
* fix(docs/querying): explain `floor` behaviour more explicitly with examples
Signed-off-by: Rick Rackow <rick.rackow@paymenttools.com>
---------
Signed-off-by: Rick Rackow <rick.rackow@gmail.com>
Signed-off-by: Rick Rackow <rick.rackow@paymenttools.com>
Co-authored-by: Rick Rackow <rick.rackow@paymenttools.com>
Would love to propose @npazosmendez and @alexgreenbank to help us own remote storage (especially write).
Nico & Alex are not yet Prometheus maintainer, but I think that’s fine.
Signed-off-by: Bartlomiej Plotka <bwplotka@gmail.com>
[ENHANCEMENT] Docker SD: add MatchFirstNetwork for containers with multiple networks
Fixes docker sd service misssing in shared mode and deduplicate targets by network
* Add draining of queued notifications to `notifier.Manager`
Signed-off-by: Charles Korn <charles.korn@grafana.com>
* Update docs
Signed-off-by: Charles Korn <charles.korn@grafana.com>
* Address PR feedback
Signed-off-by: Charles Korn <charles.korn@grafana.com>
* Add more logging
Signed-off-by: Charles Korn <charles.korn@grafana.com>
* Address offline feedback: remove timeout
Signed-off-by: Charles Korn <charles.korn@grafana.com>
* Ensure stopping takes priority over further processing, make tests more robust
Signed-off-by: Charles Korn <charles.korn@grafana.com>
* Make channel unbuffered
Signed-off-by: Charles Korn <charles.korn@grafana.com>
* Update docs
Signed-off-by: Charles Korn <charles.korn@grafana.com>
* Fix race in test
Signed-off-by: Charles Korn <charles.korn@grafana.com>
* Remove unnecessary context
Signed-off-by: Charles Korn <charles.korn@grafana.com>
* Make Stop safe to call multiple times
Signed-off-by: Charles Korn <charles.korn@grafana.com>
---------
Signed-off-by: Charles Korn <charles.korn@grafana.com>
* expose hook for block querier
Signed-off-by: Ben Ye <benye@amazon.com>
* update comment
Signed-off-by: Ben Ye <benye@amazon.com>
* use defined type
Signed-off-by: Ben Ye <benye@amazon.com>
---------
Signed-off-by: Ben Ye <benye@amazon.com>
beorn7