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Commit Graph

9 Commits

Author SHA1 Message Date
Oncilla
8ef02a61aa
prometheus: add histogram support to exporter (#601)
This PR adds histogram support to the prometheus exporter.

- Adds a new aggregator selector that returns a histogram for `MeasureKind`.
  The selector can be constructed using `simple.NewWithHistogramMeasure`
- Adds support for histogram aggregators in prometheus collect method.

With this PR, the default selector is changed to use histograms.

In order to support the prometheus histogram, the `aggregator.Histogram`
interface is extended with the `Sum` method.

fixes #487

Co-authored-by: Rahul Patel <rahulpa@google.com>
2020-04-01 14:36:37 -07:00
Tyler Yahn
a485d0ec64
Update License header for all source files (#586)
* Update License header for all source files

- Add Apache 2.0 header to source files that did not have one.
- Update all existing headers dated to 2019 to be 2020
- Remove comma from License header to comply with the Apache 2.0
  guidelines.

* Update Copyright notice

Use the standard Copyright notices outlined by the
[CNCF](https://github.com/cncf/foundation/blob/master/copyright-notices.md#copyright-notices)
2020-03-23 22:41:10 -07:00
Joshua MacDonald
d8682c1999
Refactor the SDK helpers, create MeterImpl (#560)
* Create MeterImpl interface

* Checkpoint w/ sdk.go building

* Checkpoint working on global

* api/global builds (test fails)

* Test fix

* All tests pass

* Comments

* Add two tests

* Comments and uncomment tests

* Precommit part 1

* Still working on tests

* Lint

* Add a test and a TODO

* Cleanup

* Lint

* Interface()->Implementation()

* Apply some feedback

* From feedback

* (A)Synchronous -> (A)Sync

* Add a missing comment

* Apply suggestions from code review

Co-Authored-By: Krzesimir Nowak <qdlacz@gmail.com>

* Rename a variable

Co-authored-by: Krzesimir Nowak <qdlacz@gmail.com>
2020-03-19 12:02:46 -07:00
Joshua MacDonald
23e65ac79d
Remove metric options; rename "counter" aggregator to "sum" (#541)
* Remove options (mostly)

* Rename counter aggregator to 'sum'

* Fix prometheus test

* Rewordings from feedback
2020-03-11 20:21:34 -07:00
Joshua MacDonald
9674c81cb7
Drop the gauge instrument (#537)
* drop gauge instrument

* Restore the benchmark and stress test for lastvalue aggregator, but remove monotonic last-value support

* Rename gauge->lastvalue and remove remaining uses of the word 'gauge'

Co-authored-by: Krzesimir Nowak <krzesimir@kinvolk.io>
2020-03-10 16:00:37 -07:00
Rahul Patel
a202f16100
Add observer metric (#474)
* wip: observers

* wip: float observers

* fix copy pasta

* wip: rework observers in sdk

* small fix in global meter

* wip: aggregators and selectors

* wip: monotonicity option for observers

* some refactor

* wip: docs

needs more package docs (especially for api/metric and sdk/metric)

* fix ci

* Fix copy-pasta in docs

Co-Authored-By: Mauricio Vásquez <mauricio@kinvolk.io>

* recycle unused recorders in observers

if a recorder for a labelset is unused for a second collection cycle
in a row, drop it

* unregister

* thread-safe set callback

* Fix docs

* Revert "wip: aggregators and selectors"

This reverts commit 37b7d05aed5dc90f6d5593325b6eb77494e21736.

* update selector

* tests

* Rework number equality

Compare concrete numbers, so we can get actual numbers in the error
message when they are not equal, not some uint64 representation. This
also uses InDelta for comparing floats.

* Ensure that Observers are registered in the same order

* Run observers in fixed order

So the tests can be reproducible - iterating a map made the order of
measurements random.

* Ensure the proper alignment of the delegates

This wasn't checked at all. After adding the checks, the test-386
failed.

* Small tweaks to the global meter test

* Ensure proper alignment of the callback pointer

test-386 was complaining about it

* update docs

* update a TODO

* address review issues

* drop SetCallback

Co-authored-by: Mauricio Vásquez <mauricio@kinvolk.io>
Co-authored-by: Rahul Patel <rghetia@yahoo.com>
2020-03-05 12:15:30 -08:00
ET
fef504d469 Add Min() interface - rename MaxSumCount to MinMaxSumCount (#352)
* Add Min() interface - rename MaxSumCount to MinMaxSumCount

Fixes https://github.com/open-telemetry/opentelemetry-go/issues/319

* update stdout exporter to collect and output the minimum value
* update min and max atomically in Aggregator Update
* changed all references to maxsumcount to minmaxsumcount

* Address PR comments
2019-11-26 14:07:58 -08:00
ET
9a2484c373 Implement support for NonAbsolute Measurement MaxSumCount (#335)
* Add tests for nonabsolute and varying sign values

* Implement support for NonAbsolute Measurement MaxSumCount

Previously, the MaxSumCount aggregator failed to work correctly with
negative numbers (e.g. MeasureKind Alternate()==true).

* Pass NumberKind to MaxSumCount New() function

Allows it to set the initial state (current.max) to the correct value
based on the NumberKind.

* Revert extraneous local change

* Pass full descriptor to msc New()

This is analagous to the DDSketch New() constructor

* Remember to run make precommit first

* Add tests for empty checkpoint of MaxSumCount aggregator

An empty checkpoint should have Sum() == 0, Count() == 0 and Max()
still equal to the numberKind.Minimum()

* Return ErrEmptyDataSet if no value set by the aggregator

Remove TODO from stdout exporter to ensure that if a maxsumcount or
ddsketch aggregator returns ErrEmptyDataSet from Max(), then the
entire record will be skipped by the exporter.

Added tests to ensure the exporter doesn't send any updates for
EmptyDataSet checkpoints - for both ddsketch and maxsumcount.

* Relayout Aggreggator struct to ensure int64s are 8-byte aligned

On 32-bit architectures, Go only guarantees that primitive
values are aligned to a 4 byte boundary. Atomic operations on 32-bit
machines require 8-byte alignment.

See https://github.com/golang/go/issues/599

* Addressing PR comments

The use of Minimum() for the default uninitialized Maximum value means
that in the unlikely condition that every recorded value for a measure
is equal to the same NumberKind.Minimum(), then the aggregator's Max()
will return ErrEmptyDataSet

* Fix PR merge issue
2019-11-25 09:51:49 -08:00
Joshua MacDonald
9878f3b700 Metrics stdout export pipeline (#265)
* Add MetricAggregator.Merge() implementations

* Update from feedback

* Type

* Ckpt

* Ckpt

* Add push controller

* Ckpt

* Add aggregator interfaces, stdout encoder

* Modify basic main.go

* Main is working

* Batch stdout output

* Sum udpate

* Rename stdout

* Add stateless/stateful Batcher options

* Undo a for-loop in the example, remove a done TODO

* Update imports

* Add note

* Rename defaultkeys

* Support variable label encoder to speed OpenMetrics/Statsd export

* Lint

* Doc

* Precommit/lint

* Simplify Aggregator API

* Record->Identifier

* Remove export.Record a.k.a. Identifier

* Checkpoint

* Propagate errors to the SDK, remove a bunch of 'TODO warn'

* Checkpoint

* Introduce export.Labels

* Comments in export/metric.go

* Comment

* More merge

* More doc

* Complete example

* Lint fixes

* Add a testable example

* Lint

* Let Export return an error

* add a basic stdout exporter test

* Add measure test; fix aggregator APIs

* Use JSON numbers, not strings

* Test stdout exporter error

* Add a test for the call to RangeTest

* Add error handler API to improve correctness test; return errors from RecordOne

* Undo the previous -- do not expose errors

* Add simple selector variations, test

* Repair examples

* Test push controller error handling

* Add SDK label encoder tests

* Add a defaultkeys batcher test

* Add an ungrouped batcher test

* Lint new tests

* Respond to krnowak's feedback

* Undo comment

* Use concrete receivers for export records and labels, since the constructors return structs not pointers

* Bug fix for stateful batchers; clone an aggregator for long term storage

* Remove TODO addressed in #318

* Add errors to all aggregator interfaces

* Handle ErrNoLastValue case in stdout exporter

* Move aggregator API into sdk/export/metric/aggregator

* Update all aggregator exported-method comments

* Document the aggregator APIs

* More aggregator comments

* Add multiple updates to the ungrouped test

* Fixes for feedback from Gustavo and Liz

* Producer->CheckpointSet; add FinishedCollection

* Process takes an export.Record

* ReadCheckpoint->CheckpointSet

* EncodeLabels->Encode

* Format a better inconsistent type error; add more aggregator API tests

* More RangeTest test coverage

* Make benbjohnson/clock a test-only dependency

* Handle ErrNoLastValue in stress_test
2019-11-15 13:01:20 -08:00