Commit graph

214 commits

Author SHA1 Message Date
Bryan Boreham 9bc6d7a7db Update package scrape tests for new labels.Labels type
Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
2022-12-19 15:22:09 +00:00
Bryan Boreham 91254fb187 Update package scrape for new labels.Labels type
Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
2022-12-19 15:22:09 +00:00
Bryan Boreham 3c7de69059 storage: allow re-use of iterators
Patterned after `Chunk.Iterator()`: pass the old iterator in so it
can be re-used to avoid allocating a new object.

(This commit does not do any re-use; it is just changing all the method
signatures so re-use is possible in later commits.)

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
2022-12-15 18:32:45 +00:00
Xiaochao Dong (@damnever) 9979024a30 Report error if the series contains invalid metric names or labels during scrape
Signed-off-by: Xiaochao Dong (@damnever) <the.xcdong@gmail.com>
2022-12-08 20:01:20 +08:00
Björn Rabenstein a61c4b266a
scrape: Fix accept header, now for real (#11552)
This reinstates the behavior of v2.39. The header got messed up in the
sparsehistogram when the change of the version in main was merged into
it (and the merge conflict had to be resolved).

I don't think the current state will actually break anyone, although
it is technically possible. I propose to merge this into the bugfix
branch in any case, but I think we can wait for other bugfixes before
cutting a v2.40.1. (Unless, of course, somebody reports an actual
breakage because of the header.)

Signed-off-by: beorn7 <beorn@grafana.com>
2022-11-09 11:19:25 +01:00
Björn Rabenstein 54ce07e9a0
scrape: Fix accept header (#11542)
First of all, there was a typo: `encoding=delimited` was a left-over
in the `scrapeAcceptHeader`.

Second, the recently updated `version=1.0.0` prevents current versions
of client_golang to negotiate OpenMetrics, as they expect
`version=0.0.1` or no version at all. This commit adds, with lower
priority, the latter (no version at all) to the accept header.

Fixes #11540,

Signed-off-by: beorn7 <beorn@grafana.com>
2022-11-07 18:22:03 +01:00
Ganesh Vernekar 3cbf87b83d
Enable protobuf negotiation only when histograms are enabled
Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>
2022-10-12 13:27:22 +05:30
Jesus Vazquez e934d0f011 Merge 'main' into sparsehistogram
Signed-off-by: Jesus Vazquez <jesus.vazquez@grafana.com>
2022-10-05 22:14:49 +02:00
Bryan Boreham 4927e13537 scrape tests: undo EmptyLabels change
Needs other code changes otherwise tests fail

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
2022-09-09 13:34:49 +02:00
Bryan Boreham 14780c3b4e scrape: in tests use labels.FromStrings
And a few cases of `EmptyLabels()`.
Replacing code which assumes the internal structure of `Labels`.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
2022-09-09 13:34:49 +02:00
Bogdan Drutu 3cde9287a6
scrape: remove unused member from cacheEntry (#11281)
Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>
2022-09-08 00:01:01 +02:00
Bogdan Drutu f736a9e953
scrape: remove duplicate mutex unlock (#11282)
Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>

Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>
2022-09-08 00:00:14 +02:00
Bogdan Drutu c8cfe5c25d
scrape: remove unused argument in newScrapeLoop (#11283)
Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>

Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>
2022-09-07 23:59:57 +02:00
Cosrider bef6556ca5
delete redundant alias (#11180)
Signed-off-by: Cosrider <cosrider7@gmail.com>

Signed-off-by: Cosrider <cosrider7@gmail.com>
2022-08-31 15:50:38 +02:00
Paschalis Tsilias 5a8e202f94
Append metadata to the WAL in the scrape loop (#10312)
* Append metadata to the WAL

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Remove extra whitespace; Reword some docstrings and comments

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Use RLock() for hasNewMetadata check

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Use single byte for metric type in RefMetadata

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Update proposed WAL format for single-byte type metadata

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Address first round of review comments

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Amend description of metadata in wal.md

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Correct key used to retrieve metadata from cache

When we're setting metadata entries in the scrapeCace, we're using the
p.Help(), p.Unit(), p.Type() helpers, which retrieve the series name and
use it as the cache key. When checking for cache entries though, we used
p.Series() as the key, which included the metric name _with_ its labels.
That meant that we were never actually hitting the cache. We're fixing
this by utiling the __name__ internal label for correctly getting the
cache entries after they've been set by setHelp(), setType() or
setUnit().

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Put feature behind a feature flag

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Reorder WAL format document

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Fix CR comments

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Extract logic about changing metadata in an anonymous function

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Implement new proposed WAL format and amend relevant tests

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Use 'const' for metadata field names

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Apply metadata to head memSeries in Commit, not in AppendMetadata

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Add docstring and rename extracted helper in scrape.go

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Fix review comments around TestMetadata* tests

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Rebase with merged TSDB changes; fix duplicate definitions after rebase

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Remove leftover changes on db_test.go

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Rename feature flag

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Simplify updateMetadata helper function

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Remove extra newline

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>
2022-08-31 15:50:05 +02:00
Marc Tudurí f7df3b86ba
histograms: parse float histograms from proto definition (#11149)
* histograms: parse float histograms from proto definition

Signed-off-by: Marc Tuduri <marctc@protonmail.com>

* Improve comment

Signed-off-by: Marc Tuduri <marctc@protonmail.com>

* Ignore float buckets

Signed-off-by: Marc Tuduri <marctc@protonmail.com>

* Refactor Histogram() function

Signed-off-by: Marc Tuduri <marctc@protonmail.com>

* Fix test_float_histogram

Signed-off-by: Marc Tuduri <marctc@protonmail.com>

* Update model/textparse/protobufparse.go

Co-authored-by: Ganesh Vernekar <15064823+codesome@users.noreply.github.com>
Signed-off-by: Marc Tudurí <marctc@protonmail.com>

* Update protobufparse.go

Signed-off-by: Marc Tudurí <marctc@protonmail.com>

* Update scrape.go

Signed-off-by: Marc Tudurí <marctc@protonmail.com>

* Update scrape/scrape.go

Co-authored-by: Ganesh Vernekar <15064823+codesome@users.noreply.github.com>
Signed-off-by: Marc Tudurí <marctc@protonmail.com>

Signed-off-by: Marc Tuduri <marctc@protonmail.com>
Signed-off-by: Marc Tudurí <marctc@protonmail.com>
Co-authored-by: Ganesh Vernekar <15064823+codesome@users.noreply.github.com>
2022-08-25 20:37:41 +05:30
Bryan Boreham 8b863c42dd
Optimise relabeling by re-using memory (#11147)
* model/relabel: Add benchmark

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

* model/relabel: re-use Builder across relabels

Saves memory allocations.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

* labels.Builder: allow re-use of result slice

This reduces memory allocations where the caller has a suitable slice available.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

* model/relabel: re-use source values slice

To reduce memory allocations.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

* Unwind one change causing test failures

Restore original behaviour in PopulateLabels, where we must not overwrite the input set.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

* relabel: simplify values optimisation

Use a stack-based array for up to 16 source labels, which will be the
vast majority of cases.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

* lint

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
2022-08-19 15:27:52 +05:30
beorn7 c9fd3c235d Merge branch 'main' into sparsehistogram 2022-08-10 17:54:37 +02:00
Levi Harrison d61459d826
no-default-scrape-port feature flag (#9523)
* Add `no-default-scrape-port` flag

Signed-off-by: Levi Harrison <git@leviharrison.dev>
2022-07-20 13:35:47 +02:00
Paschalis Tsilias d1122e0743
Introduce TSDB changes for appending metadata to the WAL (#10972)
* Append metadata to the WAL

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Remove extra whitespace; Reword some docstrings and comments

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Use RLock() for hasNewMetadata check

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Use single byte for metric type in RefMetadata

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Update proposed WAL format for single-byte type metadata

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Implementa MetadataAppender interface for the Agent

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Address first round of review comments

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Amend description of metadata in wal.md

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Correct key used to retrieve metadata from cache

When we're setting metadata entries in the scrapeCace, we're using the
p.Help(), p.Unit(), p.Type() helpers, which retrieve the series name and
use it as the cache key. When checking for cache entries though, we used
p.Series() as the key, which included the metric name _with_ its labels.
That meant that we were never actually hitting the cache. We're fixing
this by utiling the __name__ internal label for correctly getting the
cache entries after they've been set by setHelp(), setType() or
setUnit().

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Put feature behind a feature flag

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Fix AppendMetadata docstring

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Reorder WAL format document

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Change error message of AppendMetadata; Fix access of s.meta in AppendMetadata

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Reuse temporary buffer in Metadata encoder

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Only keep latest metadata for each refID during checkpointing

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Fix test that's referencing decoding metadata

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Avoid creating metadata block if no new metadata are present

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Add tests for corrupt metadata block and relevant record type

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Fix CR comments

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Extract logic about changing metadata in an anonymous function

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Implement new proposed WAL format and amend relevant tests

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Use 'const' for metadata field names

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Apply metadata to head memSeries in Commit, not in AppendMetadata

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Add docstring and rename extracted helper in scrape.go

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Add tests for tsdb-related cases

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Fix linter issues vol1

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Fix linter issues vol2

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Fix Windows test by closing WAL reader files

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Use switch instead of two if statements in metadata decoding

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Fix review comments around TestMetadata* tests

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Add code for replaying WAL; test correctness of in-memory data after a replay

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Remove scrape-loop related code from PR

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Address first round of comments

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Simplify tests by sorting slices before comparison

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Fix test to use separate transactions

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Empty out buffer and record slices after encoding latest metadata

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Fix linting issue

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Update calculation for DroppedMetadata metric

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Rename MetadataAppender interface and AppendMetadata method to MetadataUpdater/UpdateMetadata

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Reuse buffer when encoding latest metadata for each series

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Fix review comments; Check all returned error values using two helpers

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Simplify use of helpers

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>

* Satisfy linter

Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>
2022-07-19 10:58:52 +02:00
beorn7 28f028e938 Merge branch 'main' into sparsehistogram 2022-07-12 19:07:13 +02:00
Julien Pivotto 90583c8906
TestScrapeLoopCache: Display content of the appender (#10937)
This should help identifying windows tests flakiness.

Signed-off-by: Julien Pivotto <roidelapluie@o11y.eu>
2022-07-01 14:28:56 +02:00
Xiaonan Shen 0c3abdc26d
Keep relabeled scrape interval and timeout on reloads (#10916)
* Preserve relabeled scrape interval and timeout on reloads

Signed-off-by: Xiaonan Shen <s@sxn.dev>
2022-06-28 11:58:52 +02:00
beorn7 40ad5e284a Merge branch 'main' into beorn7/sparsehistogram 2022-06-09 20:50:30 +02:00
Alban Hurtaud 41630b8e88
Add hidden flag to configure discovery loop interval (#10634)
* Add hidden flag to configure discovery loop interval

Signed-off-by: Alban HURTAUD <alban.hurtaud@amadeus.com>
2022-05-06 00:42:04 +02:00
beorn7 3bc711e333 Merge branch 'main' into sparsehistogram 2022-05-04 13:37:13 +02:00
Goutham Veeramachaneni 2381d7be57
Send target and metadata cache in context (again) (#10636)
* Send target and metadata cache in context (again)

The previous attempt was rolled back in #10590 due to memory issues.

`sl.parentCtx` and `sl.ctx` both had a copy of the cache and target info
in the previous attempt and it was hard to pin-point where the context
was being retained causing the memory increase.

I've experimented a bunch in #10627 to figure out that this approach doesn't
cause memory increase. Beyond that, just using this info in _any_ other context
is causing a memory increase.

The change fixed a bunch of long-standing in the OTel Collector that the
community was waiting on and release is blocked on a few downstream distrubutions
of OTel Collector waiting on a fix. I propose to merge this change in while
I investigate what is happening.

Signed-off-by: Goutham Veeramachaneni <gouthamve@gmail.com>

* Gate the change behind a manager option

Signed-off-by: Goutham Veeramachaneni <gouthamve@gmail.com>
2022-05-03 11:45:52 -07:00
Matthieu MOREL e2ede285a2
refactor: move from io/ioutil to io and os packages (#10528)
* refactor: move from io/ioutil to io and os packages
* use fs.DirEntry instead of os.FileInfo after os.ReadDir

Signed-off-by: MOREL Matthieu <matthieu.morel@cnp.fr>
2022-04-27 11:24:36 +02:00
Julien Pivotto 685ce9964d
Merge pull request #10599 from prometheus/release-2.35
Merge back release 2.35
2022-04-15 00:10:06 +02:00
Goutham Veeramachaneni ec3d02019e
Pass the correct context to staleness Appender (#10588)
OTel Collector prints the following error when a target disappears:

```
2022-04-13T14:20:24.932-0400	warn	scrape/scrape.go:1408	Stale append failed	{"kind": "receiver", "name": "prometheus", "scrape_pool": "beep-boop", "target": "http://localhost:9090/metrics", "error": "transaction aborted"}
```

This `transaction aborted` error is returned by the custom appender that is
used by the collector when the context of the appender is cancelled:
b7bf11174e/receiver/prometheusreceiver/internal/otlp_transaction.go (L81-L82)

We call `endOfRunStaleness` after `sl.stop()` which cancels `sl.ctx`.
The other `.Appender()` calls use `parentCtx` for the same reason.

This hasn't come up so far because Prometheus' Appender implementation just
ignores the context passed.

Signed-off-by: Goutham Veeramachaneni <gouthamve@gmail.com>
2022-04-14 10:03:07 -04:00
Julien Pivotto db8c550570
Revoke storing target and metadata cache in context. (#10590)
Storing the scrape cache and the target (which also contains that cache)
is apparently causing hige memory increase. I think me might not control
the lifespan of the context enough, therefore old objects keep living in
memory for longer than needed.

Let's unblock the release and look for an alternative so that downstream
consumers can get access to that data.

Signed-off-by: Julien Pivotto <roidelapluie@o11y.eu>
2022-04-14 15:18:46 +02:00
Jayapriya Pai 580e852f10 scrape: Update error message for label limits
Signed-off-by: Jayapriya Pai <janantha@redhat.com>
2022-04-14 11:43:17 +02:00
beorn7 7ee1836ef5 Merge branch 'main' into sparsehistogram 2022-04-05 18:31:19 +02:00
Robert Fratto 44a5e705be
discovery: Expose custom HTTP client options to discoverers (#10462)
* discovery: expose HTTP client options to discoverers

Signed-off-by: Robert Fratto <robertfratto@gmail.com>

* discovery/http: use HTTP client options for created client

Signed-off-by: Robert Fratto <robertfratto@gmail.com>

* scrape: use a list of HTTP client options instead of just dial context

Signed-off-by: Robert Fratto <robertfratto@gmail.com>

* discovery: rephrase comment

Signed-off-by: Robert Fratto <robertfratto@gmail.com>
2022-03-24 18:16:59 -04:00
Goutham Veeramachaneni 4d8bbfd416
Add target to context (#10473)
Signed-off-by: Goutham Veeramachaneni <gouthamve@gmail.com>
2022-03-24 16:53:04 +01:00
beorn7 4210aac74a Merge branch 'main' into sparsehistogram 2022-03-22 14:47:42 +01:00
Alvin Lin 8b5eb562b1 Re-generate test cert to fix test_windows test failures
Signed-off-by: Alvin Lin <alvinlin@amazon.com>
2022-03-17 19:37:18 +01:00
Goutham Veeramachaneni c4f8020dca
Embed MetadaStore in scrape context (#10450)
This will allow downstream users to easily access metadata required.

Signed-off-by: Goutham Veeramachaneni <gouthamve@gmail.com>
2022-03-16 09:45:15 +01:00
Robert Fratto f0ec619eec
scrape: allow providing a custom Dialer for scraping (#10415)
* scrape: allow providing a custom Dialer for scraping

This commit extends config.ScrapeConfig with an optional field to
override how HTTP connections to targets are created. This field is not
set directly in Prometheus, and is only added for the convenience of
downstream importers.

Closes #9706

Signed-off-by: Robert Fratto <robertfratto@gmail.com>

* scrape: move custom dial function to scrape.Options

Signed-off-by: Robert Fratto <robertfratto@gmail.com>
2022-03-09 00:48:47 +01:00
Jayapriya Pai edfe657b54
scrape: Fix label_limits cache usage (#10370)
Fixes #10344

Signed-off-by: Jayapriya Pai <janantha@redhat.com>
2022-03-03 18:37:53 +01:00
Julien Pivotto f695df843f Improve content-type error handling
- Call err everywhere
- Change log message to underscore-separated field

Followup on #10186

Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>
2022-02-08 11:02:51 +01:00
Matheus Pimenta 8d8ce641a4
error for invalid media type should not be completely swallowed (#10186)
* error for invalid media type should not be completely swallowed

Signed-off-by: Matheus Pimenta <matheuscscp@gmail.com>
2022-02-08 10:57:56 +01:00
Jonatan Ivanov b6df3b6f67
Prefer 1.0.0 in the accept header for application/openmetrics-text (#9431)
related: https://github.com/prometheus/client_java/issues/702
fixes gh-9430

Signed-off-by: Jonatan Ivanov <jonatan.ivanov@gmail.com>
2022-01-28 00:37:51 +01:00
beorn7 86cc83b13c storage: iterator fixes after merge
Signed-off-by: beorn7 <beorn@grafana.com>
2021-12-18 14:12:01 +01:00
beorn7 64c7bd2b08 Merge branch 'main' into sparsehistogram 2021-12-18 14:04:25 +01:00
Julius Volz fa552b98bb
Merge pull request #9996 from roidelapluie/fixreportlimit
Fix reporting metrics when sample limit is reached during the report
2021-12-17 13:17:07 +01:00
Julien Pivotto 67a64ee092
Remove check against cfg so interval/ timeout are always set (#10023) (#10031)
Signed-off-by: Nicholas Blott <blottn@tcd.ie>

Co-authored-by: Nicholas Blott <blottn@tcd.ie>
2021-12-16 16:46:14 +01:00
Julien Pivotto e94a0b28e1 Append reporting metrics without limit
If reporting metrics fails due to reaching the limit, this makes the
target appear as UP in the UI, but the metrics are missing.

This commit bypasses that limit for report metrics.

Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>
2021-12-16 13:26:53 +01:00
Björn Rabenstein 7e42acd3b1
tsdb: Rework iterators (#9877)
- Pick At... method via return value of Next/Seek.
- Do not clobber returned buckets.
- Add partial FloatHistogram suppert.

Note that the promql package is now _only_ dealing with
FloatHistograms, following the idea that PromQL only knows float
values.

As a byproduct, I have removed the histogramSeries metric. In my
understanding, series can have both float and histogram samples, so
that metric doesn't make sense anymore.

As another byproduct, I have converged the sampleBuf and the
histogramSampleBuf in memSeries into one. The sample type stored in
the sampleBuf has been extended to also contain histograms even before
this commit.

Signed-off-by: beorn7 <beorn@grafana.com>
2021-11-29 13:24:23 +05:30
beorn7 5d4db805ac Merge branch 'main' into sparsehistogram 2021-11-17 19:57:31 +01:00