* migrate Clock classes to API
- move Clock* + Util into API
- add a deprecated wrapper for ClockFactory and Util
- remove unused StopWatch* classes
* review feedback
* replace ClockFactory with Clock
It's not really a factory, and really only provides access to a system clock. Create a
Clock class which is more clear in its purpose.
* remove time Util class
per review feedback, it's only used in Zipkin. Removed some unused consts from ClockInterface
* Apply suggestions from code review
Co-authored-by: Tobias Bachert <git@b-privat.de>
---------
Co-authored-by: Tobias Bachert <git@b-privat.de>
* Add metrics implementation
* Apply cs-fixer
* Downgrade to php 7.4
* [TODO] Suppress phan for now
* Add basic example
* [TODO] Remove outdated prometheus example for now
* Add otlp metric converter
* Add metric stream tests
* Downgrade to php 7.4 - fix asynchronous counter instrument type
* Add missing psalm-suppress annotations
* Add `ext-gmp` to composer suggest
* Fix `Sdk` -> `SDK`
* Remove `_bridge.php`
* Add array typehints
* Add `Interface` suffix to interfaces
* Add aggregation / attribute processor / staleness handler tests
* Apply rector
* Simplify filtered attribute processor
* Move instrument deduplication to meter
Allows removing view registry dependency from `MetricFactory`.
Should ideally turn of staleness handling for asynchronous instruments with permanently registered callbacks (drop all `::onStale()` callbacks and prevent addition of new callbacks).
* Allow injecting metric factory
* Release `::onStale()` callbacks if permanent observer callback registered
* Add `MultiObserver` tests
* Add php-doc for exporter temporality
* Resolve phan issues
* Add note about forward compatibility
* Add exemplar tests
* Remove special handling for callbacks being registered multiple times
Was mainly a side-effect of using `spl_object_id()`; lead to inconsistent behavior between providing same and identical callbacks; reverting back to incrementing index, keyspace is large enough.
* Add basic `Meter` / `MeterProvider` tests
* Add view `SelectionCriteria` tests
* Allow `MetricReader`s to configure default aggregation
- move default aggregation handling to metric reader / metric exporter
- move view registration to meter provider constructor
- move exemplar reservoir creation to aggregation to support user implementations
- remove `AttributeProcessor` from view as baggage access was dropped from spec
- deduplicate metric streams
* Add support for weakening `$this` reference of asynchronous callbacks
* Minor improvements
- add missing `Interface` suffix
- move callback destructors to metric observer to not detach if meter and meter provider are out of scope
- simplify `::viewRegistrationRequests()` by readding fallback view
* Add OTLP metric exporter
* Log export failure
* Minor improvements
- rename `MetricObserver::weakMap()` to `::destructors()` to better reflect usage`
- move `ReferenceCounter::acquire()` call to corresponding `MetricObserver::observe()` call for consistency
- cache instrumentation scope id in `Meter` to avoid repeated calls to `serialize()`
- remove obsolete instrument type check from `ViewProjection`, leftover from supporting aggregation per type
* Suppress `PhanAccessMethodInternal` due to being too strict for our usecase
* Add workaround for observer segfault if destruct is initiated by `WeakMap` key going out of scope
* Mark internal classes as internal
* Add in-memory and stream exporter
* Add metric converter test
* Add metric observer tests
* Add view registry tests
* Add metric reader tests
* Improve stream test coverage
* Improve meter test coverage
* Apply rector
* Add delayed staleness handler
Brett McBride
Tobias Bachert