syslog messages appear truncated for Citrix ADC

We are using rsyslog to capture the logs in Observium.  The messages from our Citrix ADC virtual appliances seem to be truncated.

Original message (tcpdump on port 514):

10:49:36.461706 IP (tos 0x0, ttl 253, id 19565, offset 0, flags [none], proto UDP (17), length 228)
10.250.128.20.32730 > 10.250.32.100.syslog: [udp sum ok] SYSLOG, length: 200
Facility local0 (16), Severity notice (5)
Msg: 01/19/2021:09:49:33 GMT DCRX-ANS-P003 0-PPE-0 : default EVENT DEVICEDOWN 35996673 0 : Device "server_serviceGroup_NSSVC_SSL_10.250.65.21:8636(SVG_PRD_HTTPS_DS?DCRX-LDM-P002?8636)" - State DOWN\0x0a
0x0000: 3c31 3333 3e20 3031 2f31 392f 3230 3231
0x0010: 3a30 393a 3439 3a33 3320 474d 5420 4443
0x0020: 5258 2d41 4e53 2d50 3030 3320 302d 5050
0x0030: 452d 3020 3a20 6465 6661 756c 7420 4556
0x0040: 454e 5420 4445 5649 4345 444f 574e 2033
0x0050: 3539 3936 3637 3320 3020 3a20 2044 6576
0x0060: 6963 6520 2273 6572 7665 725f 7365 7276
0x0070: 6963 6547 726f 7570 5f4e 5353 5643 5f53
0x0080: 534c 5f31 302e 3235 302e 3635 2e32 313a
0x0090: 3836 3336 2853 5647 5f50 5244 5f48 5454
0x00a0: 5053 5f44 533f 4443 5258 2d4c 444d 2d50
0x00b0: 3030 323f 3836 3336 2922 202d 2053 7461
0x00c0: 7465 2044 4f57 4e0a

Syslog debug output (enabled #$config['syslog']['debug'] = TRUE:

[2021/01/19 10:48:22 +0100] syslog.php(84224): dcrx-ans-p003||16||5||5||||2021-01-19 10:48:22|| 01/19/2021:09:48:19 GMT DCRX-ANS-P003 0-PPE-0 : default EVENT DEVICEDOWN 35993973 0 : Device "server_serviceGroup_NSSVC_SSL_10.250.65.21:8636(SVG_PRD_HTTPS_DS?DCRX-LDM-P002?8636)" - State DOWN||
[2021/01/19 10:48:59 +0100] syslog.php(84224): dcrx-ans-p003||16||5||5||||2021-01-19 10:48:59|| 01/19/2021:09:48:56 GMT DCRX-ANS-P003 0-PPE-0 : default EVENT DEVICEUP 35995288 0 : Device "server_serviceGroup_NSSVC_SSL_10.250.65.21:8636(SVG_PRD_HTTPS_DS?DCRX-LDM-P002?8636)" - State UP||
[2021/01/19 10:49:36 +0100] syslog.php(84224): dcrx-ans-p003||16||5||5||||2021-01-19 10:49:36|| 01/19/2021:09:49:33 GMT DCRX-ANS-P003 0-PPE-0 : default EVENT DEVICEDOWN 35996673 0 : Device "server_serviceGroup_NSSVC_SSL_10.250.65.21:8636(SVG_PRD_HTTPS_DS?DCRX-LDM-P002?8636)" - State DOWN||
[2021/01/19 10:50:08 +0100] syslog.php(84224): dcrx-ans-p003||16||5||5||||2021-01-19 10:50:08|| 01/19/2021:09:50:06 GMT DCRX-ANS-P003 0-PPE-0 : default EVENT DEVICEUP 35997958 0 : Device "server_serviceGroup_NSSVC_SSL_10.250.65.21:8636(SVG_PRD_HTTPS_DS?DCRX-LDM-P002?8636)" - State UP||
[2021/01/19 10:50:24 +0100] syslog.php(84224): dcrx-ans-p003||16||5||5||||2021-01-19 10:50:24|| 01/19/2021:09:50:22 GMT DCRX-ANS-P003 0-PPE-0 : default EVENT DEVICEDOWN 35998539 0 : Device "server_serviceGroup_NSSVC_SSL_10.250.65.21:8636(SVG_PRD_HTTPS_DS?DCRX-LDM-P002?8636)" - State DOWN||
[2021/01/19 10:50:57 +0100] syslog.php(84224): dcrx-ans-p003||16||5||5||||2021-01-19 10:50:57|| 01/19/2021:09:50:54 GMT DCRX-ANS-P003 0-PPE-0 : default EVENT DEVICEUP 35999829 0 : Device "server_serviceGroup_NSSVC_SSL_10.250.65.21:8636(SVG_PRD_HTTPS_DS?DCRX-LDM-P002?8636)" - State UP||

The output in the Observium web interface: