Java garbage collection took longer than expected for service service_name, pid pid on resource resource_name in instance instance_id. The time was gc_millseconds millseconds. The service might be overloaded or the resource might be undersized.
Java garbage collection frees up unused memory for a process. If it repeatedly takes a long time complete, the service could be overloaded, the resource could be undersized to run the service, or other processes could be consuming large amounts of memory or processing power on the resource.
Try increasing the maximum Java Virtual Machine (JVM) size for the service, switching the service to a resource with more available memory and processing power, or moving other processes off of the resource.