[compatible] Zipkin compatible #3728#4014

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chickenlj merged 10 commits intoapache:masterfrom

cvictory:zip_compatible_3728

May 17, 2019

Commits on Jan 25, 2019

fix #2842. remove duplicate SPI definitions for 2.7.x
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Commits on Feb 21, 2019

Merge branch 'master' of github.com:apache/incubator-dubbo
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fix: rename the thread name from DubboRegistryFailedRetryTimer to DubboMetadataReportRetryTimer in MetadataReportRetry
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Commits on Apr 8, 2019

Merge branch 'master' of github.com:apache/incubator-dubbo
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Commits on Apr 10, 2019

Merge branch 'master' of github.com:apache/incubator-dubbo
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Commits on Apr 16, 2019

Merge branch 'master' of github.com:apache/incubator-dubbo
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Commits on Apr 18, 2019

Merge branch 'master' of github.com:apache/incubator-dubbo
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Commits on Apr 19, 2019

fix compatible with zipkin. #3728
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Commits on May 16, 2019

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