[7.x] docs: add 6.8.15 release notes (#4974) (#4978)

[bmorelli25]

Backports the following commits to 7.x:

• docs: add 6.8.15 release notes ([6.8] Add 6.8.15 release notes #4974) (docs: add 6.8.15 release notes (#4974) #4978)

[apmmachine]

💔 Build Failed

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Build stats

• Build Cause: Pull request #4979 opened

• Start Time: 2021-03-22T16:18:08.063+0000

• Duration: 39 min 39 sec

• Commit: 41c4d13

Test stats 🧪

Test	Results
Failed	0
Passed	3301
Skipped	126
Total	3427

Trends 🧪

Steps errors

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Run Window tests

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OSX build

• Took 0 min 27 sec . View more details on here
• Description: .ci/scripts/build-darwin.sh

OSX build

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• Description: .ci/scripts/build-darwin.sh

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• Description: ./.ci/scripts/sync.sh

Log output

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[2021-03-22T16:51:03.658Z] === SKIP: x-pack/apm-server/sampling/pubsub TestElasticsearchIntegration_SubscribeSampledTraceIDs (0.00s)
[2021-03-22T16:51:03.658Z]     pubsub_integration_test.go:244: Skipping integration test, export INTEGRATION_TESTS=1 to run
[2021-03-22T16:51:03.658Z] 
[2021-03-22T16:51:03.658Z] DONE 1448 tests, 5 skipped in 141.233s
[2021-03-22T16:51:06.946Z] >> go test: Unit Test Passed
[2021-03-22T16:51:06.946Z] System testing 
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/apmpackage/cmd/gen-package
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/beater/beatertest
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/cmd/pprofessor
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/elasticsearch/estest
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/model/modeldecoder/generator
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/model/modeldecoder/generator/cmd
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/model/modeldecoder/generator/generatortest
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/model/modeldecoder/modeldecodertest
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/processor/stream/package_tests
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/sourcemap/test
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/tests
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/tests/loader
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/tests/system/jaegergrpc
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/x-pack/apm-server
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/x-pack/apm-server/aggregation/spanmetrics
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/x-pack/apm-server/aggregation/txmetrics
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/x-pack/apm-server/cmd
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/x-pack/apm-server/include
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/x-pack/apm-server/sampling
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/x-pack/apm-server/sampling/eventstorage
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/x-pack/apm-server/sampling/pubsub
[2021-03-22T16:51:13.514Z] warning: no packages being tested depend on matches for pattern github.com/elastic/apm-server/x-pack/apm-server/sampling/pubsub/pubsubtest
[2021-03-22T16:51:13.514Z] 
[2021-03-22T16:51:14.894Z] Running python tests
[2021-03-22T16:51:21.508Z] 2021/03/22 16:51:21 exec: go list -m
[2021-03-22T16:51:22.079Z] >> python test: Unit Testing
[2021-03-22T16:51:24.617Z] ============================= test session starts =============================
[2021-03-22T16:51:24.617Z] platform win32 -- Python 3.8.1, pytest-6.0.1, py-1.9.0, pluggy-0.13.1
[2021-03-22T16:51:24.617Z] rootdir: C:\Users\jenkins\workspace\pm-server_apm-server-mbp_PR-4979\src\github.com\elastic\apm-server
[2021-03-22T16:51:24.617Z] plugins: rerunfailures-9.0, timeout-1.3.4
[2021-03-22T16:51:24.617Z] timeout: 90.0s
[2021-03-22T16:51:24.617Z] timeout method: thread
[2021-03-22T16:51:24.617Z] timeout func_only: False
[2021-03-22T16:51:24.617Z] collected 142 items
[2021-03-22T16:51:24.617Z] 
[2021-03-22T16:51:24.617Z] tests\system\test_apikey_cmd.py sssss                                    [  3%]
[2021-03-22T16:51:34.603Z] tests\system\test_auth.py ..sssssssss                                    [ 11%]
[2021-03-22T16:51:34.603Z] tests\system\test_export.py sss                                          [ 13%]
[2021-03-22T16:51:34.603Z] tests\system\test_integration.py ssssssssssssssssssssssss                [ 30%]
[2021-03-22T16:51:34.603Z] tests\system\test_integration_acm.py sssssssss                           [ 36%]
[2021-03-22T16:51:34.603Z] tests\system\test_integration_sourcemap.py ssssssssssssss                [ 46%]
[2021-03-22T16:51:34.603Z] tests\system\test_jaeger.py sssss                                        [ 50%]
[2021-03-22T16:51:34.603Z] tests\system\test_pipelines.py sssssss                                   [ 54%]
[2021-03-22T16:53:26.085Z] tests\system\test_requests.py ...........................                [ 73%]
[2021-03-22T16:53:26.085Z] tests\system\test_setup_index_management.py sssssssssssssss              [ 84%]
[2021-03-22T16:53:26.085Z] tests\system\test_tls.py ssssssssssssssssssssss                          [100%]
[2021-03-22T16:53:26.085Z] 
[2021-03-22T16:53:26.085Z] ============================== warnings summary ===============================
[2021-03-22T16:53:26.085Z] c:\users\jenkin~1.pac\appdata\local\temp\python-env\build\ve\windows\lib\site-packages\_pytest\junitxml.py:446
[2021-03-22T16:53:26.085Z]   c:\users\jenkin~1.pac\appdata\local\temp\python-env\build\ve\windows\lib\site-packages\_pytest\junitxml.py:446: PytestDeprecationWarning: The 'junit_family' default value will change to 'xunit2' in pytest 6.0. See:
[2021-03-22T16:53:26.085Z]     https://docs.pytest.org/en/stable/deprecations.html#junit-family-default-value-change-to-xunit2
[2021-03-22T16:53:26.085Z]   for more information.
[2021-03-22T16:53:26.085Z]     _issue_warning_captured(deprecated.JUNIT_XML_DEFAULT_FAMILY, config.hook, 2)
[2021-03-22T16:53:26.085Z] 
[2021-03-22T16:53:26.085Z] -- Docs: https://docs.pytest.org/en/stable/warnings.html
[2021-03-22T16:53:26.085Z] - generated xml file: C:\Users\jenkins\workspace\pm-server_apm-server-mbp_PR-4979\src\github.com\elastic\apm-server\build\TEST-python-unit.xml -
[2021-03-22T16:53:26.085Z] ============================ slowest 20 durations =============================
[2021-03-22T16:53:26.085Z] 8.11s call     tests/system/test_requests.py::RateLimitTest::test_rate_limit_small_hit
[2021-03-22T16:53:26.085Z] 7.69s call     tests/system/test_requests.py::ClientSideTest::test_ok
[2021-03-22T16:53:26.085Z] 7.68s call     tests/system/test_requests.py::CorsTest::test_ok
[2021-03-22T16:53:26.085Z] 5.25s call     tests/system/test_auth.py::TestAccessDefault::test_full_access
[2021-03-22T16:53:26.086Z] 4.18s call     tests/system/test_auth.py::TestAccessWithSecretToken::test_backend_intake
[2021-03-22T16:53:26.086Z] 4.17s call     tests/system/test_requests.py::CorsTest::test_preflight_bad_headers
[2021-03-22T16:53:26.086Z] 4.12s call     tests/system/test_requests.py::RateLimitTest::test_multiple_ips_rate_limit
[2021-03-22T16:53:26.086Z] 4.11s call     tests/system/test_requests.py::RateLimitTest::test_multiple_ips_rate_limit_hit
[2021-03-22T16:53:26.086Z] 4.10s call     tests/system/test_requests.py::RateLimitTest::test_rate_limit
[2021-03-22T16:53:26.086Z] 4.10s call     tests/system/test_requests.py::RateLimitTest::test_rate_limit_hit
[2021-03-22T16:53:26.086Z] 3.60s call     tests/system/test_requests.py::RateLimitTest::test_rate_limit_only_metadata
[2021-03-22T16:53:26.086Z] 3.19s call     tests/system/test_requests.py::Test::test_gzip
[2021-03-22T16:53:26.086Z] 3.19s call     tests/system/test_requests.py::Test::test_ok
[2021-03-22T16:53:26.086Z] 3.18s call     tests/system/test_requests.py::Test::test_validation_fail
[2021-03-22T16:53:26.086Z] 3.18s call     tests/system/test_requests.py::Test::test_deflate
[2021-03-22T16:53:26.086Z] 3.17s call     tests/system/test_requests.py::Test::test_ok_verbose
[2021-03-22T16:53:26.086Z] 3.17s call     tests/system/test_requests.py::Test::test_expvar_default
[2021-03-22T16:53:26.086Z] 3.17s call     tests/system/test_requests.py::Test::test_bad_json
[2021-03-22T16:53:26.086Z] 3.16s call     tests/system/test_requests.py::Test::test_not_existent
[2021-03-22T16:53:26.086Z] 3.16s call     tests/system/test_requests.py::Test::test_rum_default_disabled
[2021-03-22T16:53:26.086Z] =========== 29 passed, 113 skipped, 1 warning in 114.84s (0:01:54) ============
[2021-03-22T16:53:26.086Z] >> python test: Unit Testing Complete
[2021-03-22T16:53:27.260Z] Post stage
[2021-03-22T16:53:27.295Z] Recording test results
[2021-03-22T16:53:28.113Z] [Checks API] No suitable checks publisher found.
[2021-03-22T16:56:42.257Z] [INFO] For detailed information see: https://apm-ci.elastic.co/job/apm-integration-tests-selector-mbp/job/7.x/409/display/redirect
[2021-03-22T16:56:42.540Z] Copied 17 artifacts from "APM Integration Test MBP Selector » 7.x" build number 409
[2021-03-22T16:56:43.758Z] Post stage
[2021-03-22T16:56:43.783Z] Recording test results
[2021-03-22T16:56:44.681Z] [Checks API] No suitable checks publisher found.
[2021-03-22T16:56:45.619Z] Running on Jenkins in /var/lib/jenkins/workspace/pm-server_apm-server-mbp_PR-4979
[2021-03-22T16:56:45.762Z] [INFO] getVaultSecret: Getting secrets
[2021-03-22T16:56:45.988Z] Masking supported pattern matches of $VAULT_ADDR or $VAULT_ROLE_ID or $VAULT_SECRET_ID
[2021-03-22T16:56:47.158Z] + chmod 755 generate-build-data.sh
[2021-03-22T16:56:47.158Z] + ./generate-build-data.sh https://apm-ci.elastic.co/blue/rest/organizations/jenkins/pipelines/apm-server/apm-server-mbp/PR-4979/ https://apm-ci.elastic.co/blue/rest/organizations/jenkins/pipelines/apm-server/apm-server-mbp/PR-4979/runs/1 UNSTABLE 2318820
[2021-03-22T16:56:47.709Z] INFO: curl https://apm-ci.elastic.co/blue/rest/organizations/jenkins/pipelines/apm-server/apm-server-mbp/PR-4979/runs/1/steps/?limit=10000 -o steps-info.json
[2021-03-22T16:56:48.620Z] INFO: curl https://apm-ci.elastic.co/blue/rest/organizations/jenkins/pipelines/apm-server/apm-server-mbp/PR-4979/runs/1/tests/?status=FAILED -o tests-errors.json