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Implement https://github.com/open-telemetry/opentelemetry-specification/pull/2452 #1456

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merged 93 commits into from
Jun 17, 2022

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@owent owent commented Jun 16, 2022

Fixes #1455

Follow the lastest specification changes.

Implement open-telemetry/opentelemetry-specification#2452

I also merged main nefore I start to achive this specification. It bring many changes of main branch.

Please visit https://github.com/open-telemetry/opentelemetry-cpp/pull/1456/files/b4d47e1ffd077c282a6efb86e701d383dcff7b1a..31dfd5a5bfcb17f376d878c3981ad6dbb0c312d8 to view the real changes of this PR.

Changes

  • Update the latest main branch.
  • Remove AsyncBatch*Processor
  • Using configure to decide whether to use async exporting.

For significant contributions please make sure you have completed the following items:

  • CHANGELOG.md updated for non-trivial changes
  • Unit tests have been added
  • Changes in public API reviewed

esigo and others added 30 commits March 21, 2022 07:02
* add owent as reviewer

* fix order
Co-authored-by: Tom Tan <Tom.Tan@microsoft.com>
Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>
Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>
owent and others added 19 commits May 25, 2022 12:11
…alues (open-telemetry#1427)

* validate histogram value

* handle Nan

* add changelog

* divide by 0 error on windows

* fix markdown lint
Signed-off-by: WenTao Ou <admin@owent.net>

# Conflicts:
#	CHANGELOG.md
Signed-off-by: WenTao Ou <admin@owent.net>
@owent owent requested a review from a team June 16, 2022 09:58
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codecov bot commented Jun 16, 2022

Codecov Report

❗ No coverage uploaded for pull request base (async-changes@d7b03e8). Click here to learn what that means.
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@@               Coverage Diff                @@
##             async-changes    #1456   +/-   ##
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Signed-off-by: WenTao Ou <admin@owent.net>
}
# ifdef ENABLE_ASYNC_EXPORT
, asynchronous_mode_ { asynchronous_mode }
# endif
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@lalitb lalitb Jun 16, 2022

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Just a thought - Is it necessary to keep the sync mode, or can we have async as default and only option? And ExportResult would always mean that exporter has received the event batch and uploading them. Upload may fail, in which case exporter will retry and eventually log the error.

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@owent owent Jun 17, 2022

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OTLP may also need always return ExportResult::kSuccess and ignore the result of HTTP client.

Signed-off-by: WenTao Ou <admin@owent.net>
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lalitb commented Jun 17, 2022

Thanks. I have gone through this PR - https://github.com/open-telemetry/opentelemetry-cpp/pull/1456/files/b4d47e1ffd077c282a6efb86e701d383dcff7b1a..31dfd5a5bfcb17f376d878c3981ad6dbb0c312d8 - for relavant changes, and it looks good to me. I think you should be able to merge this to the async-changes branch right?

@owent owent merged commit daf5091 into open-telemetry:async-changes Jun 17, 2022
@owent owent deleted the async-changes branch June 17, 2022 06:51
owent added a commit to owent/opentelemetry-cpp that referenced this pull request Jun 17, 2022
commit daf5091
Author: WenTao Ou <admin@owent.net>
Date:   Fri Jun 17 14:49:27 2022 +0800

    Implement open-telemetry/opentelemetry-specification#2452 (open-telemetry#1456)

    * install sdk config (open-telemetry#1273)

    * Bump actions/cache from 2 to 3 (open-telemetry#1277)

    * Add owent as an Approver (open-telemetry#1276)

    * add owent as reviewer

    * fix order

    * Disable benchmark action failure (open-telemetry#1284)

    * metrics exemplar round 1 (open-telemetry#1264)

    * [Metrics SDK] - fix spelling (AggregationTemporarily to AggregationTemporality) (open-telemetry#1288)

    * fix compilation error with protobuf 3.5 (open-telemetry#1289)

    * Fix span SetAttribute crash (open-telemetry#1283)

    * Synchronous Metric collection (Delta , Cumulative) (open-telemetry#1265)

    * Rename `http_client_curl` to `opentelemetry_http_client_curl` (open-telemetry#1301)

    Signed-off-by: owent <admin@owent.net>

    * Don't show coverage annotation for pull requests (open-telemetry#1304)

    * Implement periodic exporting metric reader (open-telemetry#1286)

    * Add `async-changes` branch to pull_request of github action (open-telemetry#1309)

    Signed-off-by: owent <admin@owent.net>

    * Add InstrumentationInfo and Resource to the metrics data to be exported. (open-telemetry#1299)

    * Excempt should be applied on issue instead of PR (open-telemetry#1316)

    * Bump codecov/codecov-action from 2.1.0 to 3 (open-telemetry#1318)

    * Move public definitions into `opentelemetry_api`. (open-telemetry#1314)

    Signed-off-by: owent <admin@owent.net>

    * Add building test without RTTI (open-telemetry#1294)

    * Remove implicitly deleted default constructor (open-telemetry#1267)

    Co-authored-by: Tom Tan <Tom.Tan@microsoft.com>
    Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>

    * [ETW Exporter] - ETW provider handle cleanup (open-telemetry#1322)

    * Bump actions/stale from 4 to 5 (open-telemetry#1323)

    * ostream metrics example (open-telemetry#1312)

    * Prepare v1.3.0 release (open-telemetry#1324)

    * Update yield logic for ARM processor (open-telemetry#1325)

    * Fix for open-telemetry#1292 (open-telemetry#1326)

    * Implement Merge and Diff operation for Histogram Aggregation (open-telemetry#1303)

    * fix metrics compiler warnings (open-telemetry#1328)

    * Replace deprecated googletest API (open-telemetry#1327)

    * Remove redundant tail / in CMake install (open-telemetry#1329)

    * dependencies image as artifact (open-telemetry#1333)

    Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>

    * metrics histogram example (open-telemetry#1330)

    * Link `opentelemetry_ext` with `opentelemetry_api` (open-telemetry#1336)

    * ostream metrics cmake (open-telemetry#1344)

    * prometheus exporter (open-telemetry#1331)

    * remove exporter registration to meter provider (open-telemetry#1350)

    * Bump github/codeql-action from 1 to 2 (open-telemetry#1351)

    Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

    * Add explicit type cast in baggage UrlDecode (open-telemetry#1353)

    * Fix scalar delete against array (open-telemetry#1356)

    * conditional include for codecvt header (open-telemetry#1355)

    * Add missing include guard (open-telemetry#1357)

    * Use latest TraceLoggingDynamic.h (open-telemetry#1354)

    * prometheus example (open-telemetry#1332)

    * Fix output time in metrics OStream exporter (open-telemetry#1346)

    * Simplify SDK Configuration: Use View with default aggregation if no matching View is configured (open-telemetry#1358)

    * Fix class member initialization order (open-telemetry#1360)

    * codecov ignore (open-telemetry#1364)

    * export opentelemetry_otlp_recordable (open-telemetry#1365)

    * Disable test on prometheus-cpp which not need (open-telemetry#1363)

    * Enable metric collection for Async Instruments - Delta and Cumulative  (open-telemetry#1334)

    * fix baggage propagation for empty/invalid baggage context (open-telemetry#1367)

    * Fix empty tracestate header propagation (open-telemetry#1373)

    * Bump docker/setup-qemu-action from 1 to 2 (open-telemetry#1375)

    * Add noexcept/const qualifier at missing places for Trace API. (open-telemetry#1374)

    * fix noxcept

    * fix etw

    * Bump docker/build-push-action from 2 to 3 (open-telemetry#1377)

    * Bump docker/setup-buildx-action from 1 to 2 (open-telemetry#1376)

    * [Metrics SDK] Remove un-necessary files. (open-telemetry#1379)

    * reuse temporal metric storage for sync storage (open-telemetry#1369)

    * Prometheus exporter meters and instrument name (open-telemetry#1378)

    * Fix sharing resource in batched exported spans (open-telemetry#1386)

    Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>

    * fix: missing link to nlohmann_json (open-telemetry#1390)

    * Getting started document using ostream exporter (open-telemetry#1394)

    Co-authored-by: Reiley Yang <reyang@microsoft.com>

    * Connect async storage with async instruments (open-telemetry#1388)

    * get span_id from context when Logger::Log received invalid span_id  (open-telemetry#1398)

    * Alpine image (open-telemetry#1382)

    * Upgrade proto to v0.17.0, update log data model (open-telemetry#1383)

    * Prepare v1.4.0 release (open-telemetry#1404)

    * Fix vcpkg package name in doc (open-telemetry#1392)

    * Document Getting Started with Prometheus and Grafana (open-telemetry#1396)

    Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>

    * fix OTEL_INTERNAL_LOG_INFO (open-telemetry#1407)

    * fix: WaitOnSocket select error when sockfd above FD_SETSIZE (open-telemetry#1410)

    * [BUILD] fix nlohmann_json's (third party) include dir (open-telemetry#1415)

    * [Metrics API/SDK] - Pass state to async callback function. (open-telemetry#1408)

    * Copy string_view passed to ETW exporter in PropertyVariant (open-telemetry#1425)

    * Fix ETW log exporter header inclusion (open-telemetry#1426)

    * [Metrics SDK] Only record non-negative / finite / Non-NAN histogram values (open-telemetry#1427)

    * validate histogram value

    * handle Nan

    * add changelog

    * divide by 0 error on windows

    * fix markdown lint

    * Fix global log handle symbols when using dlopen (open-telemetry#1420)

    * Add attributes/dimensions to metrics ostream exporter (open-telemetry#1400)

    * Log current timestamp instead of epoch time (open-telemetry#1434)

    * install sdk-config.h (open-telemetry#1419)

    * Fix GettingStarted documentation for Jaeger HTTP exporter (open-telemetry#1347) (open-telemetry#1439)

    * fix histogram (open-telemetry#1440)

    * Upgrade nlohmann_json to 3.10.5 (open-telemetry#1438) (open-telemetry#1441)

    * Fixed broken link to OpenTelemetry.io (open-telemetry#1445) (open-telemetry#1446)

    * Fix variables inizialization (open-telemetry#1430)

    * Remove `AsyncBatch*Processor`, implement [opentelemetry-specification#2452](open-telemetry/opentelemetry-specification#2452)

    Signed-off-by: WenTao Ou <admin@owent.net>

    * Remove invalid changelog

    Signed-off-by: WenTao Ou <admin@owent.net>

    * Fix compiling problems without `ENABLE_ASYNC_EXPORT`

    Signed-off-by: WenTao Ou <admin@owent.net>

    * Always return `ExportResult::kSuccess`

    Signed-off-by: WenTao Ou <admin@owent.net>

    Co-authored-by: Ehsan Saei <71217171+esigo@users.noreply.github.com>
    Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
    Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>
    Co-authored-by: Tom Tan <Tom.Tan@microsoft.com>
    Co-authored-by: Ben Landrum <71329856+benlandrum@users.noreply.github.com>
    Co-authored-by: jmanjon <67091862+juandemanjon@users.noreply.github.com>
    Co-authored-by: Zsolt Bölöny <bolony.zsolt@gmail.com>
    Co-authored-by: Leo Di Donato <leodidonato@gmail.com>
    Co-authored-by: Reiley Yang <reyang@microsoft.com>
    Co-authored-by: Lalit Kumar Bhasin <labhas@microsoft.com>
    Co-authored-by: Hamed Mansouri <hamed0381@gmail.com>
    Co-authored-by: ztao <t@taozj.org>
    Co-authored-by: Flier Lu <flier@users.noreply.github.com>
    Co-authored-by: Marc Alff <marc.alff@free.fr>
    Co-authored-by: Marc Alff <marc.alff@oracle.com>
    Co-authored-by: univisionsrl <31103417+univisionsrl@users.noreply.github.com>

commit f357102
Author: WenTao Ou <admin@owent.net>
Date:   Wed Jun 15 22:40:39 2022 +0800

    Merge main into async changes (open-telemetry#1451)

    * install sdk config (open-telemetry#1273)

    * Bump actions/cache from 2 to 3 (open-telemetry#1277)

    * Add owent as an Approver (open-telemetry#1276)

    * add owent as reviewer

    * fix order

    * Disable benchmark action failure (open-telemetry#1284)

    * metrics exemplar round 1 (open-telemetry#1264)

    * [Metrics SDK] - fix spelling (AggregationTemporarily to AggregationTemporality) (open-telemetry#1288)

    * fix compilation error with protobuf 3.5 (open-telemetry#1289)

    * Fix span SetAttribute crash (open-telemetry#1283)

    * Synchronous Metric collection (Delta , Cumulative) (open-telemetry#1265)

    * Rename `http_client_curl` to `opentelemetry_http_client_curl` (open-telemetry#1301)

    Signed-off-by: owent <admin@owent.net>

    * Don't show coverage annotation for pull requests (open-telemetry#1304)

    * Implement periodic exporting metric reader (open-telemetry#1286)

    * Add `async-changes` branch to pull_request of github action (open-telemetry#1309)

    Signed-off-by: owent <admin@owent.net>

    * Add InstrumentationInfo and Resource to the metrics data to be exported. (open-telemetry#1299)

    * Excempt should be applied on issue instead of PR (open-telemetry#1316)

    * Bump codecov/codecov-action from 2.1.0 to 3 (open-telemetry#1318)

    * Move public definitions into `opentelemetry_api`. (open-telemetry#1314)

    Signed-off-by: owent <admin@owent.net>

    * Add building test without RTTI (open-telemetry#1294)

    * Remove implicitly deleted default constructor (open-telemetry#1267)

    Co-authored-by: Tom Tan <Tom.Tan@microsoft.com>
    Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>

    * [ETW Exporter] - ETW provider handle cleanup (open-telemetry#1322)

    * Bump actions/stale from 4 to 5 (open-telemetry#1323)

    * ostream metrics example (open-telemetry#1312)

    * Prepare v1.3.0 release (open-telemetry#1324)

    * Update yield logic for ARM processor (open-telemetry#1325)

    * Fix for open-telemetry#1292 (open-telemetry#1326)

    * Implement Merge and Diff operation for Histogram Aggregation (open-telemetry#1303)

    * fix metrics compiler warnings (open-telemetry#1328)

    * Replace deprecated googletest API (open-telemetry#1327)

    * Remove redundant tail / in CMake install (open-telemetry#1329)

    * dependencies image as artifact (open-telemetry#1333)

    Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>

    * metrics histogram example (open-telemetry#1330)

    * Link `opentelemetry_ext` with `opentelemetry_api` (open-telemetry#1336)

    * ostream metrics cmake (open-telemetry#1344)

    * prometheus exporter (open-telemetry#1331)

    * remove exporter registration to meter provider (open-telemetry#1350)

    * Bump github/codeql-action from 1 to 2 (open-telemetry#1351)

    Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

    * Add explicit type cast in baggage UrlDecode (open-telemetry#1353)

    * Fix scalar delete against array (open-telemetry#1356)

    * conditional include for codecvt header (open-telemetry#1355)

    * Add missing include guard (open-telemetry#1357)

    * Use latest TraceLoggingDynamic.h (open-telemetry#1354)

    * prometheus example (open-telemetry#1332)

    * Fix output time in metrics OStream exporter (open-telemetry#1346)

    * Simplify SDK Configuration: Use View with default aggregation if no matching View is configured (open-telemetry#1358)

    * Fix class member initialization order (open-telemetry#1360)

    * codecov ignore (open-telemetry#1364)

    * export opentelemetry_otlp_recordable (open-telemetry#1365)

    * Disable test on prometheus-cpp which not need (open-telemetry#1363)

    * Enable metric collection for Async Instruments - Delta and Cumulative  (open-telemetry#1334)

    * fix baggage propagation for empty/invalid baggage context (open-telemetry#1367)

    * Fix empty tracestate header propagation (open-telemetry#1373)

    * Bump docker/setup-qemu-action from 1 to 2 (open-telemetry#1375)

    * Add noexcept/const qualifier at missing places for Trace API. (open-telemetry#1374)

    * fix noxcept

    * fix etw

    * Bump docker/build-push-action from 2 to 3 (open-telemetry#1377)

    * Bump docker/setup-buildx-action from 1 to 2 (open-telemetry#1376)

    * [Metrics SDK] Remove un-necessary files. (open-telemetry#1379)

    * reuse temporal metric storage for sync storage (open-telemetry#1369)

    * Prometheus exporter meters and instrument name (open-telemetry#1378)

    * Fix sharing resource in batched exported spans (open-telemetry#1386)

    Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>

    * fix: missing link to nlohmann_json (open-telemetry#1390)

    * Getting started document using ostream exporter (open-telemetry#1394)

    Co-authored-by: Reiley Yang <reyang@microsoft.com>

    * Connect async storage with async instruments (open-telemetry#1388)

    * get span_id from context when Logger::Log received invalid span_id  (open-telemetry#1398)

    * Alpine image (open-telemetry#1382)

    * Upgrade proto to v0.17.0, update log data model (open-telemetry#1383)

    * Prepare v1.4.0 release (open-telemetry#1404)

    * Fix vcpkg package name in doc (open-telemetry#1392)

    * Document Getting Started with Prometheus and Grafana (open-telemetry#1396)

    Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>

    * fix OTEL_INTERNAL_LOG_INFO (open-telemetry#1407)

    * fix: WaitOnSocket select error when sockfd above FD_SETSIZE (open-telemetry#1410)

    * [BUILD] fix nlohmann_json's (third party) include dir (open-telemetry#1415)

    * [Metrics API/SDK] - Pass state to async callback function. (open-telemetry#1408)

    * Copy string_view passed to ETW exporter in PropertyVariant (open-telemetry#1425)

    * Fix ETW log exporter header inclusion (open-telemetry#1426)

    * [Metrics SDK] Only record non-negative / finite / Non-NAN histogram values (open-telemetry#1427)

    * validate histogram value

    * handle Nan

    * add changelog

    * divide by 0 error on windows

    * fix markdown lint

    * Fix global log handle symbols when using dlopen (open-telemetry#1420)

    * Add attributes/dimensions to metrics ostream exporter (open-telemetry#1400)

    * Log current timestamp instead of epoch time (open-telemetry#1434)

    * install sdk-config.h (open-telemetry#1419)

    * Fix GettingStarted documentation for Jaeger HTTP exporter (open-telemetry#1347) (open-telemetry#1439)

    * fix histogram (open-telemetry#1440)

    * Upgrade nlohmann_json to 3.10.5 (open-telemetry#1438) (open-telemetry#1441)

    * Fixed broken link to OpenTelemetry.io (open-telemetry#1445) (open-telemetry#1446)

    Co-authored-by: Ehsan Saei <71217171+esigo@users.noreply.github.com>
    Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
    Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>
    Co-authored-by: Tom Tan <Tom.Tan@microsoft.com>
    Co-authored-by: Ben Landrum <71329856+benlandrum@users.noreply.github.com>
    Co-authored-by: jmanjon <67091862+juandemanjon@users.noreply.github.com>
    Co-authored-by: Zsolt Bölöny <bolony.zsolt@gmail.com>
    Co-authored-by: Leo Di Donato <leodidonato@gmail.com>
    Co-authored-by: Reiley Yang <reyang@microsoft.com>
    Co-authored-by: Lalit Kumar Bhasin <labhas@microsoft.com>
    Co-authored-by: Hamed Mansouri <hamed0381@gmail.com>
    Co-authored-by: ztao <t@taozj.org>
    Co-authored-by: Flier Lu <flier@users.noreply.github.com>
    Co-authored-by: Marc Alff <marc.alff@free.fr>
    Co-authored-by: Marc Alff <marc.alff@oracle.com>

commit d7b03e8
Author: WenTao Ou <admin@owent.net>
Date:   Fri May 20 13:25:24 2022 +0800

    Merge main into async changes (open-telemetry#1411)

commit 0aebd6e
Author: WenTao Ou <admin@owent.net>
Date:   Mon May 16 23:26:41 2022 +0800

    Merge main into async changes (open-telemetry#1395)

commit 08a12b5
Author: WenTao Ou <admin@owent.net>
Date:   Thu May 12 00:51:48 2022 +0800

    Cocurrency otlp http session (open-telemetry#1317)

commit c614258
Author: DEBAJIT DAS <85024550+DebajitDas@users.noreply.github.com>
Date:   Wed May 4 22:55:20 2022 +0530

     Added max async export support using separate AsyncBatchSpan/LogProcessor (open-telemetry#1306)

commit 465158c
Author: WenTao Ou <admin@owent.net>
Date:   Mon Apr 25 23:48:02 2022 +0800

    Merge `main` into `async-changes` (open-telemetry#1348)

    * install sdk config (open-telemetry#1273)

    * Bump actions/cache from 2 to 3 (open-telemetry#1277)

    * Add owent as an Approver (open-telemetry#1276)

    * add owent as reviewer

    * fix order

    * Disable benchmark action failure (open-telemetry#1284)

    * metrics exemplar round 1 (open-telemetry#1264)

    * [Metrics SDK] - fix spelling (AggregationTemporarily to AggregationTemporality) (open-telemetry#1288)

    * fix compilation error with protobuf 3.5 (open-telemetry#1289)

    * Fix span SetAttribute crash (open-telemetry#1283)

    * Synchronous Metric collection (Delta , Cumulative) (open-telemetry#1265)

    * Rename `http_client_curl` to `opentelemetry_http_client_curl` (open-telemetry#1301)

    Signed-off-by: owent <admin@owent.net>

    * Don't show coverage annotation for pull requests (open-telemetry#1304)

    * Implement periodic exporting metric reader (open-telemetry#1286)

    * Add `async-changes` branch to pull_request of github action (open-telemetry#1309)

    Signed-off-by: owent <admin@owent.net>

    * Add InstrumentationInfo and Resource to the metrics data to be exported. (open-telemetry#1299)

    * Excempt should be applied on issue instead of PR (open-telemetry#1316)

    * Bump codecov/codecov-action from 2.1.0 to 3 (open-telemetry#1318)

    * Move public definitions into `opentelemetry_api`. (open-telemetry#1314)

    Signed-off-by: owent <admin@owent.net>

    * Add building test without RTTI (open-telemetry#1294)

    * Remove implicitly deleted default constructor (open-telemetry#1267)

    Co-authored-by: Tom Tan <Tom.Tan@microsoft.com>
    Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>

    * [ETW Exporter] - ETW provider handle cleanup (open-telemetry#1322)

    * Bump actions/stale from 4 to 5 (open-telemetry#1323)

    * ostream metrics example (open-telemetry#1312)

    * Prepare v1.3.0 release (open-telemetry#1324)

    * Update yield logic for ARM processor (open-telemetry#1325)

    * Fix for open-telemetry#1292 (open-telemetry#1326)

    * Implement Merge and Diff operation for Histogram Aggregation (open-telemetry#1303)

    * fix metrics compiler warnings (open-telemetry#1328)

    * Replace deprecated googletest API (open-telemetry#1327)

    * Remove redundant tail / in CMake install (open-telemetry#1329)

    * dependencies image as artifact (open-telemetry#1333)

    Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>

    * metrics histogram example (open-telemetry#1330)

    * Link `opentelemetry_ext` with `opentelemetry_api` (open-telemetry#1336)

    * ostream metrics cmake (open-telemetry#1344)

    * Fix conflicts

    Signed-off-by: owent <admin@owent.net>

    * Using clang-format-10 to format codes(clang-format-14 has a different output)

    Signed-off-by: owent <admin@owent.net>

    Co-authored-by: Ehsan Saei <71217171+esigo@users.noreply.github.com>
    Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
    Co-authored-by: Lalit Kumar Bhasin <lalit_fin@yahoo.com>
    Co-authored-by: Tom Tan <Tom.Tan@microsoft.com>
    Co-authored-by: Ben Landrum <71329856+benlandrum@users.noreply.github.com>
    Co-authored-by: jmanjon <67091862+juandemanjon@users.noreply.github.com>

commit 73f3515
Author: WenTao Ou <admin@owent.net>
Date:   Wed Apr 6 15:41:42 2022 +0800

    Merge main into async changes (open-telemetry#1321)

commit ad3bdfe
Author: DEBAJIT DAS <85024550+DebajitDas@users.noreply.github.com>
Date:   Thu Mar 31 09:56:24 2022 +0530

    Added feature flag for asynchronous export (open-telemetry#1295)

commit 15e7725
Author: WenTao Ou <admin@owent.net>
Date:   Tue Mar 29 13:09:11 2022 +0800

    Cocurrency otlp http session (open-telemetry#1281)

commit 729c2f8
Author: DEBAJIT DAS <85024550+DebajitDas@users.noreply.github.com>
Date:   Tue Mar 22 23:47:14 2022 +0530

    Changing the type of callback function in Export function to std::function (open-telemetry#1278)

commit 6f53da3
Author: DEBAJIT DAS <85024550+DebajitDas@users.noreply.github.com>
Date:   Mon Mar 21 19:31:51 2022 +0530

    Async callback Exporter to Processor changes  (open-telemetry#1275)

commit c3eaa9d
Author: WenTao Ou <owentou@tencent.com>
Date:   Mon Mar 21 14:41:51 2022 +0800

    Cocurrency otlp http session (open-telemetry#1274)
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