Hi Shammi, Yes, if one's intention is only to acquire backend latency kind of information, using observability is definitely an overkill. One way we can achieve this in APIM will be to utilize some properties we inject to the message context in certain milestones a request passes. These properties are as follows:
*api.ut.backendRequestEndTime* - The timestamp the response triggers the first APIM synapse handler (APIMgtLatencyStatsHandler) *api.ut.requestTime* - The timestamp the request triggers the first APIM synapse handler (APIMgtLatencyStatsHandler) This is a sample sequence file we have used before to obtain these stats. This can be deployed as an out sequence for the relevant api. If these stats are required for all apis, a global handler can be deployed with this logic, but also adding some api identifier information to the log as well. <sequence xmlns="http://ws.apache.org/ns/synapse"; name="out"> <property name="CURRENT_TIME" expression="get-property('SYSTEM_TIME')"/> <property name="BACKEND_TIME_PROP" expression="evaluate($ctx:api.ut.backendRequestEndTime) - evaluate($ctx:api.ut.backendRequestTime)"/> <property name="RESPONSE_TIME_PROP" expression="evaluate($ctx:CURRENT_TIME) - evaluate($ctx:api.ut.requestTime)"/> <log level="custom"> <property name="BACKEND_TIME" expression="$ctx:BACKEND_TIME_PROP"/> <property name="RESPONSE_TIME" expression="$ctx:RESPONSE_TIME_PROP"/> <property name="SERVICE_TIME" expression="evaluate($ctx:RESPONSE_TIME_PROP) - evaluate($ctx:BACKEND_TIME_PROP)"/> </log> </sequence> In here: BACKEND_TIME : Time taken by the backend RESPONSE_TIME : Total roundtrip time within our gateway SERVICE_TIME : Time taken by our handlers Of course this does not give the exact time a backend took on the dot, but it gives a clear picture of the latency consumed by our handlers and the backend. Hope this helps Thanks, Arshardh -- *Arshardh Ifthikar* Senior Software Engineer | WSO2 Inc. Email: arsha...@wso2.com Mobile: +94777218551 Web: http://wso2.com <http://wso2.com/signature>
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