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The APDEX score is based on the application response time, when the application performs slowly, an alert is raised.
Clicking through the Application link (Application: Connec API) an overview of the application is displayed for the time window where the alert occurred. Digging into the Transactions section, the slowest transactions will be listed.
From there an investigation will have to be lead to find the root cause of the performance issue and address the underlying problem.
See https://maestrano.atlassian.net/wiki/x/gOTgBQ