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The coordination framework presented in this paper targets the overall supervision and E2E configuration of 5G testbeds. Features provided by the framework cover service deployment, control, management, monitoring, analytics and security in 5G testbeds to fulfil the goals of 5G Key Performance Indicators (KPIs) monitoring and validation. Moreover, this framework offers the functionalities needed for defining and automating the execution of 5G experiments. The framework is also responsible for exposing East/West interfaces to coordination entities in other testbeds, facilitating interworking. Finally, we demonstrate the applicability of the coordination framework to the validation of URLLC (Ultra-Reliable and Low-Latency Communications) KPIs.