Support of complex service status calculation and propagation rules

Current implementation of services was designed long time ago, it is rather limited and has significant limitations. Major limitations are:

• scalability: it does not scale well, also bad user experience when number of services exceeds few hundreds
• hard to configure: mapping based on triggers does not work well and requires significant effort
• very limited visualization: no graphical representation of services, no good reporting
• limited SLA calculation rules
• no alerting in case of service status changes
• user permissions: all or nothing

Proposed functionality will introduce more flexible status calculation and propagation rules.