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+..
+ This work is licensed under a Creative Commons Attribution 4.0
+ International License.
+
+=================
+Multi-Vim logging
+=================
+
+The purpose of logging is to generate machine-readable, indexable output logs and support to trace
+requests through sub-component, it need to ship logs to logging enhancement project a centralized
+logging analysis system capturing diagnostic information.
+
+
+
+Problem Description
+===================
+
+So far the logging of multi-vim is not able to support customer configuration, handler context specific logging like
+MDC[MDC_Document]_, also it dose't propagate transaction-ID in REST headers which is critical to tracing request.
+There are 4 python containers in oom project need to configure filebeat container for shipping logs.
+
+.. [MDC_Document] https://wiki.onap.org/display/DW/ONAP+Application+Logging+Guidelines+v1.1#ONAPApplicationLoggingGuidelinesv1.1-MDCs
+
+In addition the current logging is very difficult to understand behavior and performance.
+
+
+Proposed Change
+===============
+
+The proposed change will include three parts.
+
+Filebeat container
+------------------
+
+Logging architecture[Log_Architecture]_ use Filebeat collects logs from multi-vim containers and ships them to the
+centralized logging stack. To enable this feature it need to add Filebeat container in multi-vim pod that was
+deployed by OOM, as well Yaml file will be used to configure Filebeat.
+
+.. [Log_Architecture] https://wiki.onap.org/display/DW/Logging+Architecture
+
+Tracing ID
+----------
+
+ONAP logging uses a global unique "RequestID"[RequestID_Document]_ in logging to track the processing of each request
+across all the components, multi-vim will receive this id from http header by vary "X-TransactionID", then record it
+in logs.
+Meanwhile single component should generate a InvocationID that records the relationship between RequestID
+and InvocationID for proper tracing. So Mulit-vim will set unique InvocationID for each single request,also output it
+in logs.
+
+.. [RequestID_Document] https://wiki.onap.org/pages/viewpage.action?pageId=20087036#ONAPApplicationLoggingGuidelinesv1.2(Beijing)-MDC-RequestID
+
+
+python AOP logging library
+--------------------------
+
+Currently logging enhancement project just has java AOP logging library, For multi-vim which based on python need
+a python version. The basic feature of AOP logging library could provide customer configuration include retention
+policy、output location、text output format、message level and so on, support MDC context specific logging, able to
+change configuration at runtime, and make logging quite fast.
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