Hi Vaibhav,
In the documentation to Configure Transaction Traces you can see how the CEM traces are structured a little differently. CEM passes a threshold to Introscope that is based on a percentage of the Slow Time threshold, and pertains to the specific Business Transaction. The transaction trace session you initiate from Introscope does not have those same constraints.
The documentation covers how you can adjust those CEM thresholds, and also how you can specify additional matching backends or whether to trace non-identifying components. These are all ways of casting a larger net and matching more activity on the agent side.
Ultimately however, the idea is to only capture traces for extraordinary circumstances, and not for every transaction. It is one of the concepts that allows you to take noise out of the environment and focus on the real problems.
The threshold in your screenshot is already quite low. If you're not catching Business Transactions in those traces but can with even lower thresholds, I would typically consider that a success.
Regards,
Tim