* Add push mode for prometheus monitor

* format code

* fix for comments

* fix test_MetricBase bug

* Change ip to address in config

* #815 add S3 client

* #815 update S3 interface

* #815 add bucket_name_ as class field, add StartService() and StopService()

* #815 add FileIOReader and FileIOWriter

* #815 fix unittest test_storage build error

* #815 add GetObjectStr()

* #815 add S3IOReader/S3IOWriter

* #815 add ListObjects(), support put string with \0, launch S3 service when server start

* #815 read/write s3 index file pass

* #815 add MinIO related config

* #815 fix storage config issuegs

* #815 code clean

* #815 use local file or S3 via minio_enable

* #815 add DeleteObjects() for S3

* #815 print out IO rate when read_index & write_index

* #815 clean code

* #815 fix centos build error

* #815 support MinIO storage

* #815 fix typo

* Add log to debug #678

* Rename nsg_mix to RNSG in C++ sdk #735

* [skip ci] change __function__

* clang-format

* IVFTest.gpu_seal_test unittest failed #805

* rerun jenkins CI

* fix test_util

* Put C++ sdk out of milvus/core

* Delete core/src/sdk

* Add clang-format for c++ sdk

* Add README.md for sdk

* Server unittest run failed on low-end server

* set gpu_cache_capacity to 1G

* enable build milvus on centos7

* Update build enviroment Centos7 dockerfile

* Update Dockerfile

* Update Dockerfile

* Update Dockerfile

* Update Dockerfile

* Update Dockerfile

* Update Dockerfile

* Update Dockerfile

* add centos7_build_deps.sh

* add centos7 build cpu version enviroment

* add centos7 on github actions

* fix bug

* fix bug

* fix bug

* update ci/docker/centos-7-core.dockerfile

* fix github actions bug

* update centos7 case on github actions

* update docker-compose.yml

* debug centos case on github actions

* debug centos case on github actions

* add centos7 deploy dockerfile

* #665 support get/set config via CLI

* #665 support get/set config via CLI

* #665 add unittest for config CLI

* #665 remove config_node_map_

* #665 remove config_node_map_

* #665 fix clang-format

* #665 fix clang-format

* #665 update changelog

* #665 code clean

* #665 update API interface

* #665 update API interface

* #665 handle server status

* #665 handle unknown command

* #665 update debug log

* #665 rollback CmdRequest.cpp

* refactoring(create_table done)

* refactoring

* refactor server delivery (insert done)

* refactoring server module (count_table done)

* server refactor done

* cmake pass

* refactor server module done.

* set grpc response status correctly

* format done.

* fix redefine ErrorMap()

* optimize insert reducing ids data copy

* optimize grpc request with reducing data copy

* clang format

* [skip ci] Refactor server module done. update changlog. prepare for PR

* remove explicit and change int32_t to int64_t

* add TracerUtil

* Interceptor ok

* add handler

* add context

* minor update

* keep span in trace context

* add span in search okay

* Update Context.cpp

* refactor

* refactor

* refactor

* format

* add context in SearchJob

* trace search okay

* add back finish span in interceptor

* add namespace

* add tracing config in server config

* add random id

* debug mode okay

* update CMakeLists

* add opentracing to cmake

* update unittest

* add tracing namespace

* remove std::run_time error

* add lock when erasing context_map

* update tracing config

* lint

* update CHANGELOG

* small fix

* fix server unit test

* fix scheduler unit test

* fix db unit test

* lint

* fix db unit test gpu version

* rename to tracing_config

* fix

* update

* trigger ci

* remove unused function and comments

* remove always-true parameter

* run on python2 explicitly

* fix clang-format

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