APIGEE MessageLogging Policy using third-party log management service (loggly)  

You can attach and configure a MessageLogging policy on your API to log custom messages to syslog server. such as (Splunk, Sumo Logic, and Loggly)

In this article will focus in Loggly you can create a free trail account (14 days ) and try it.

lets have a few steps :)

1) add PostClientFlow to your proxy

<PostClientFlow>
        <Request/>
        <Response>
            <Step>
                <Name>MLLoggingPolicy</Name>
            </Step>
        </Response>
    </PostClientFlow>

2) inject MessageLogging policy

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<MessageLogging async="false" continueOnError="false" enabled="true" name="MLLoggingPolicy">
    <DisplayName>ML.LoggingPolicy</DisplayName>
    <Syslog>
        <Message variablePrefix="%" variableSuffix="#">[{loggly-token}@41058 tag="{apiproxy.name}"] { %message.content#, %message.headers.names# }</Message>
        <Host>logs-01.loggly.com</Host>
        <Port>514</Port>
        <FormatMessage>true</FormatMessage>
    </Syslog>
</MessageLogging>

in above step you have to replace {loggly-token} with your own token

3) Viewing Logs in Loggly

References:

- https://docs.apigee.com/api-platform/reference/policies/message-logging-policy

-https://documentation.solarwinds.com/en/Success_Center/loggly/Content/admin/streaming-syslog-without-using-files.htm?cshid=loggly_streaming-syslog-without-using-files