How check if variable is not null or is set

Icinga 2
1

Hello!
How check if variable in Service or Host object is set or is not null?
Best regards.
Tadeja

2

Two examples:

Check if host name matches and if variable is set:
assign where match("TS-*-LR01", host.name) && host.vars.dmvpn

Check if host name matches and if variable is NOT set
assign where match("TS-*-LR01", host.name) && ! host.vars.dmvpn

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