Combine things to one output?

[kriznik]

So I found this:

How to concatenate values into one to display a summary

At least form me, it gets more complicated: import java.Math.BigDecimal import org.openhab.core.library.types.* rule "HeatingDescription" when Item Office_Heat_Left_ActTemp received update or Item Office_Heat_Left_TargetTemp received update or Item Office_Heat_Left_Fault received update or Item Office_Heat_Left_StateBat received update or Item Office_Heat_Left_Valve received update or Item Office_Heat_Left_Boost received update or Item Office_Heat_Left_LowBat received update or System…

but it’s 3yrs old, so … is this approach still valid in OH2 or not?