L3 - Default based on SUPPORT-2690 and https://forum.camunda.org/t/shared-process-engine-with-sharding-datastores/1471/34
please prepare an example in https://github.com/camunda/camunda-bpm-examples that illustrates how to set up different types of shared process engine.
relevant docs:
- https://docs.camunda.org/get-started/spring/shared-process-engine/
- https://docs.camunda.org/manual/7.5/user-guide/process-engine/multi-tenancy/
- https://docs.camunda.org/manual/7.5/user-guide/process-engine/process-engine-bootstrapping/
using tomcat maven plugin example should have a shared process engine with JNDI ressources and spring integration