Disallowing services / VLANs / roles will prevent Airgroup to learn (for servers) or proxy (for users) services.
The Airgroup section in the ArubaOS User Guide is actually quite extensive. What also may help is to check the Airgroup blocked-queries:
(MM) [mynode] #show airgroup blocked-queries
AirGroup dropped Query IDs
--------------------------
Service ID #query-hits Thread Num
---------- ----------- ----------
uuid:7076436f-6e65-1063-8074-0090a9b07edc 17 1
uuid:55076f6e-6b79-4d65-6436-0090a93dc05c 17 1
uuid:73656761-7465-7375-636b-0090a9b07edc 17 1
urn:schemas-upnp-org:service:WANPPPConnection:1 394 1
uuid:7031fdaa-8058-4886-b2e7-d7e3fe658dea 17 1
urn:schemas-upnp-org:service:WANIPConnection:1 396 1
uuid:73656761-7465-7375-636b-0090a93dc05c 17 1
uuid:7a88e66f-f243-4764-a2d6-070162de8d20 17 1
uuid:d0843402-4016-4671-842f-b3ec23be1a53 17 1
urn:schemas-upnp-org:device:MediaServer:1 4 1
urn:dial-multiscreen-org:service:dial:1 7352 1
uuid:4D454930-0100-1000-8001-CC7EE7716A21 17 1
urn:schemas-upnp-org:device:InternetGatewayDevice:1 2039 1
urn:mdx-netflix-com:service:target:0 6 2
_fb._tcp 44 2
_companion-link._tcp 1937 2
....
As well, you can check the servers and users (including VLAN/role) before you start blocking to find out what is actually used:
(MM) [mynode] #show airgroup servers /md/ArubaLAB
Showing AirGroup servers under /md/ArubaLAB
AirGroup Servers
----------------
MAC IP Type Host Name Service VLAN Wired/Wireless Role Group Username AP-Name
--- -- ---- --------- ------- ---- -------------- ---- ----- -------- -------
00:1e:06:33:a7:52 192.168.12.12 mDNS kodi default-remotemgmt 12 N/A
default-airplay
Num Servers: 1.
(MM) [mynode] #show airgroup users /md/ArubaLAB
Showing AirGroup users under /md/ArubaLAB
AirGroup Users
--------------
MAC IP Type Host Name VLAN Wired/Wireless Role Group Username AP-Name
--- -- ---- --------- ---- -------------- ---- ----- -------- -------
b8:27:eb:aa:f4:72 192.168.13.203 mDNS pi03 13 wireless iot-rpi pi03 NLPD-AP215-1IKL-e0:0e
....
Num Users: 9.
(MM) [mynode] #
For centralized mode, you will run the command on the MM.
Aruba Support should be able to assist you as well to get this tuned.