Configure System Security Services Daemon to disable SUDO Smart Refresh task.

SUDO Smart Refresh task is executed periodically even if it is not used or configured.

[...]
(2021-09-22 22:10:24): [be[example.org]] [be_ptask_execute] (0x0400): Task [SUDO Smart Refresh]: executing task, timeout 900 seconds
(2021-09-22 22:10:24): [be[example.org]] [sdap_sudo_smart_refresh_send] (0x0400): Issuing a smart refresh of sudo rules (USN >= 7774)
[...]
2021-09-22 22:10:24): [be[example.org]] [sdap_sudo_refresh_connect_done] (0x0400): SUDO LDAP connection successful
(2021-09-22 22:10:24): [be[example.org]] [sdap_sudo_load_sudoers_send] (0x0400): About to fetch sudo rules
(2021-09-22 22:10:24): [be[example.org]] [sdap_search_bases_ex_next_base] (0x0400): Issuing LDAP lookup with base [DC=example,DC=org]
(2021-09-22 22:10:24): [be[example.org]] [sdap_print_server] (0x2000): Searching 172.16.0.110:389
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x0400): calling ldap_search_ext with [(&(&(objectCategory=sudoRole)(uSNChanged>=7774))(|(&(!(sudoHost=*))(cn=defaults))(sudoHost=ALL)(sudoHost=dc)(sudoHost=dc.example.org)(sudoHost=10.0.2.15)(sudoHost=10.0.2.0/24)(sudoHost=172.16.0.110)(sudoHost=172.16.0.0/24)(sudoHost=fe80::a00:27ff:fe8d:c04d)(sudoHost=fe80::/64)(sudoHost=fe80::a00:27ff:fecf:cc27)(sudoHost=fe80::/64)(sudoHost=+*)))][DC=example,DC=org].
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x1000): Requesting attrs: [objectClass]
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x1000): Requesting attrs: [objectCategory]
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x1000): Requesting attrs: [cn]
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x1000): Requesting attrs: [sudoCommand]
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x1000): Requesting attrs: [sudoHost]
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x1000): Requesting attrs: [sudoUser]
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x1000): Requesting attrs: [sudoOption]
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x1000): Requesting attrs: [sudoRunAs]
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x1000): Requesting attrs: [sudoRunAsUser]
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x1000): Requesting attrs: [sudoRunAsGroup]
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x1000): Requesting attrs: [sudoNotBefore]
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x1000): Requesting attrs: [sudoNotAfter]
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x1000): Requesting attrs: [sudoOrder]
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x1000): Requesting attrs: [uSNChanged]
(2021-09-22 22:10:24): [be[example.org]] [sdap_get_generic_ext_step] (0x2000): ldap_search_ext called, msgid = 3
[...]
(2021-09-22 22:10:24): [be[example.org]] [sdap_sudo_load_sudoers_done] (0x0200): Received 0 sudo rules
(2021-09-22 22:10:24): [be[example.org]] [sdap_id_op_done] (0x4000): releasing operation connection
(2021-09-22 22:10:24): [be[example.org]] [sdap_sudo_refresh_done] (0x0400): Received 0 rules
(2021-09-22 22:10:24): [be[example.org]] [ldb] (0x10000): start ldb transaction (nesting: 0)
(2021-09-22 22:10:24): [be[example.org]] [ldb] (0x10000): start ldb transaction (nesting: 1)
(2021-09-22 22:10:24): [be[example.org]] [sysdb_sudo_purge_byrules] (0x0400): About to remove rules from sudo cache
(2021-09-22 22:10:24): [be[example.org]] [ldb] (0x10000): commit ldb transaction (nesting: 1)
(2021-09-22 22:10:24): [be[example.org]] [ldb] (0x10000): commit ldb transaction (nesting: 0)
(2021-09-22 22:10:24): [be[example.org]] [sdap_sudo_refresh_done] (0x0400): Sudoers is successfully stored in cache
(2021-09-22 22:10:24): [be[example.org]] [sdap_sudo_set_usn] (0x0200): SUDO higher USN value: [7782]
(2021-09-22 22:10:24): [be[example.org]] [sdap_sudo_smart_refresh_done] (0x0400): Successful smart refresh of sudo rules
(2021-09-22 22:10:24): [be[example.org]] [be_ptask_done] (0x0400): Task [SUDO Smart Refresh]: finished successfully
(2021-09-22 22:10:24): [be[example.org]] [be_ptask_schedule] (0x0400): Task [SUDO Smart Refresh]: scheduling task 900 seconds from last execution time [1632349524]
[...]

The solution is to set sudo_provider to none to disable all sudo-related activity.

$ sudo cat /etc/sssd/sssd.conf 
[sssd]
domains = example.org
config_file_version = 2
services = nss, pam

[domain/example.org]
default_shell = /bin/bash
krb5_store_password_if_offline = True
cache_credentials = True
krb5_realm = EXAMPLE.ORG
realmd_tags = manages-system joined-with-samba 
id_provider = ad
fallback_homedir = /home/%u@%d
ad_domain = example.org
use_fully_qualified_names = True
ldap_id_mapping = True
access_provider = ad

sudo_provider = none

Restart sssd service.

$ sudo systemctl restart sssd

Done.