Description of problem:

DB is dropping connections for multiple users and projects.

2020-11-17 21:08:04 1169 [Warning] Aborted connection 1169 to db: 'cinder' user: 'cinder' host: '...' (Got an error reading communication packets)
2020-11-17 21:08:05 1226 [Warning] Aborted connection 1226 to db: 'cinder' user: 'cinder' host: '...' (Got an error reading communication packets)
2020-11-17 21:08:05 1170 [Warning] Aborted connection 1170 to db: 'cinder' user: 'cinder' host: '...' (Got an error reading communication packets)


Version-Release number of selected component (if applicable):

Red Hat OpenStack Platform release 16.1.2 GA (Train)
MariaDB [(none)]> SHOW VARIABLES LIKE "%version%";
+---------------------------------+------------------------------------------+
| Variable_name                   | Value                                    |
+---------------------------------+------------------------------------------+
| innodb_version                  | 10.3.17                                  |
| protocol_version                | 10                                       |
| slave_type_conversions          |                                          |
| system_versioning_alter_history | ERROR                                    |
| system_versioning_asof          | DEFAULT                                  |
| version                         | 10.3.17-MariaDB                          |
| version_comment                 | MariaDB Server                           |
| version_compile_machine         | x86_64                                   |
| version_compile_os              | Linux                                    |
| version_malloc_library          | system                                   |
| version_source_revision         | 4b5a14d0fe3d6945a0a9516261f563dcfd1f2c9c |
| version_ssl_library             | OpenSSL 1.1.1c FIPS  28 May 2019         |
| wsrep_patch_version             | wsrep_25.24                              |
+---------------------------------+------------------------------------------+
13 rows in set (0.000 sec)

As for the large scale environment, we have added these values under mysqld topic in galera.cnf and restarted the DB

max_allowed_packet = 199999488
max_connections = 8192
connect_timeout = 28800
innodb_lock_wait_timeout = 120
innodb_buffer_pool_size = 5G
innodb_buffer_pool_instances = 2
net_write_timeout = 300
net_read_timeout = 300