What does "A valid specification for SNMP device detection" mean?

General
1

I’m looking at the help documentation for the plugin API on this page:
/check_mk/plugin-api/cmk.base.plugins.agent_based.agent_based_api/v1.html

This page shows all the options for the API. For the first items listed (“all_of” thru “matches”), the return value listed is:
“A valid specification for SNMP device detection”

What does that even mean? All eight of those items have the same return value? This seems odd (as well as confusing).

2

These all are used inside the detect function for SNMP services.
Here are a small example.

DETECT_2930M = matches(".1.3.6.1.2.1.1.1.0", "Aruba.+2930M.*")

register.snmp_section(
    name="aruba_fan_status",
    detect=all_of(
        DETECT_2930M,
        exists(".1.3.6.1.4.1.11.2.14.11.5.1.54.2.1.1.*"),
    ),
....

You see, it checks if an OID exists or has some defined content. “all_of” says nothing else that, all included conditions must be met.
Point 8.4 and following describe the whole detection process.

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