Add the ability to aggregate checks on multiple items to the same host using the PCRE regular expression

Example:

It is necessary to get the amount of free space on host data storage

Items:

• vmware.hv.datastore.size [\{$ URL}, \{HOST.HOST}, _ds1_r10_6hdd_, free]
• vmware.hv.datastore.size [\{$ URL}, \{HOST.HOST}, _ds2_r0_1ssd_, free]
• vmware.hv.datastore.size [\{$ URL}, \{HOST.HOST}, _ds3_r10_6hdd_, free]
• vmware.hv.datastore.size [\{$ URL}, \{HOST.HOST}, _ds4_r10_4hdd_, free]

or

• vmware.vm.vfs.fs.size [\{$ URL}, \{HOST.HOST}, _C:_, free]
• vmware.vm.vfs.fs.size [\{$ URL}, \{HOST.HOST}, _D:_, free]

or

• vfs.fs.size [ C:, used]
• vfs.fs.size [ D:, used]

Problem:

1. When using grpsum, you cannot use sampling only by Host.
2. The key element can change the name

Possible Solution :

Extend functionality to
groupfunc ["host group or THIS", "item key or regular expression", itemfunc, timeperiod]

The resulting item will look like this:

grpsum [THIS, "vmware \ .hv \ .datastore \ .size \ [\{\ $ URL}, \{HOST \ .HOST}, (. *), free ]",last]
grpsum [THIS, "vmware \ .vm \ .vfs \ .fs \ .size \ [\{ $ URL}, \{HOST \ .HOST}, (. *), free ]", last]
grpsum [THIS, "vfs \ .fs \ .size \ [(. *), used \]", last]