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MSB mainly provides service registration and gateway functions. Other components need to rely on MSB to work properly. If MSB is not normal, other components will also fail.
PS: Starting from the london version, MSB is only enabled in the development environment
Example
For example, in the use case of holmes, the MSB is covered with
CODE refer: https://gerrit.onap.org/r/gitweb?p=testsuite.git;a=blob;f=robot/resources/holmes_interface.robot;h=6d30aa04b2eb66efc52f4d0c81574135cf89083d;hb=refs/heads/master
RESULT refer: https://logs.onap.org/onap-integration/daily/onap_daily_pod4_master/2022-05/16_02-48/xtesting-healthcheck/full/full/report.html#tags?health-holmes
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