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- opCharts generates a registry file on application startup (When needed). For this registry, it uses one of this urls.
- When this registry is generated, it creates a file for each application in var/registry/opcore/registry
- When opHA synchronises data from the poller, it also updates the registry information for each application.
- opCharts in the Master will use the opCharts registry from the poller to generate the remote url for the graphs.
If the keys opcharts_url_base and opcharts_hostname are not defined, it was also causing issues (Lab test)