Can you be more specific about what you are trying to accomplish exactly? My initial response based on my interpretation of your question would be to suggest deploying a OneAgent on the Environment ActiveGate you have configured for Internal Synthetics.
We have a requirement where customer expecting some more details under problem notification in case of failure of HTTP monitor.
HTTP monitor has post execution script with some conditions. The fail condition added in if else should populate under problem notification. More details are posted in question. Please find the link here.
I have installed oneagent on the active gate machine and configured synthetic log file via "Configure more logs" section. Now I wanted to know, how we can use these logs to get alerts/problem notification along with desired content?
You can do this by going to the settings>Log Monitoring>Events. From there you can configure the rules for events and you can set them to initiate alerts within the UI just like you have seen for anomalies on servers.
well that's progress! I would tinker around with the settings as it relates to how the log events are raised and see if you can manipulate it the way you want it. otherwise we might need to put in a Request for Feature to allow you to customize the alert data inside the problem card.
If you integrate the Dynatrace Mobile app, you will be able to click into the alert and see what data is inside it as well as leave comments on it.
Also maybe if you rename the log event to s naming convention like "Application_Message" so I would stick with a naming convention that would display "EasyTravel Service 1 Down" and that would show up on the problem card.