Ok you did all those steps but did you validate along the way?
Installed elasticsearch
Installed kibana
Did you validate elasicsearch and kibana is up and running? If so how?
Installed elasticagent
How did you install? Standalone or Fleet Managed? Did you validate that the agent is actually working and sending telemetry using the basic file or system metrics?
Configured agent and kibana yml files
What exactly did you configure?
Added modules for panw and system
Setup integration in Kibana
Seems out of order ... Load the Integration and Assets in Kibana first, then create standalone agent manifest then deploy and install agent
In general look like you are doing many of the right things but we won't be able to help debug without details, logs, errors etc.
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