Здравствуйте. В логах ошибки:
noname.xml:1: parser error : Start tag expected, '<' not found
1. Failed: cannot extract XML value with xpath "/resultset/row[field/text()='Connection_errors_select']/field[@name='Value']/text()": cannot parse xml value: Start tag expected, '<' not found
1. Failed: cannot extract XML value with xpath "/resultset/row[field/text()='Connection_errors_tcpwrap']/field[@name='Value']/text()": cannot parse xml value: Start tag expected, '<' not found
noname.xml:1: parser error : Start tag expected, '<' not found
noname.xml:1: parser error : Start tag expected, '<' not found
1. Failed: cannot extract XML value with xpath "/resultset/row[field/text()='Connection_errors_max_connections']/field[@name='Value']/text()": cannot parse xml value: Start tag expected, '<' not found
1. Failed: cannot extract XML value with xpath "/resultset/row[field/text()='Connection_errors_peer_address']/field[@name='Value']/text()": cannot parse xml value: Start tag expected, '<' not found
noname.xml:1: parser error : Start tag expected, '<' not found
1. Failed: cannot extract XML value with xpath "/resultset/row[field/text()='Connection_errors_internal']/field[@name='Value']/text()": cannot parse xml value: Start tag expected, '<' not found
noname.xml:1: parser error : Start tag expected, '<' not found
noname.xml:1: parser error : 81668:20210318:095154.819 In preprocessor_add_result()
noname.xml:1: parser error : Start tag expected, '<' not found
noname.xml:1: parser error : Start tag expected, '<' not found
noname.xml:1: parser error : 81671:20210318:095154.822 worker_preprocess_value: FAIL Preprocessing failed for: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.so...
1. Failed: cannot extract XML value with xpath "/resultset/row[field/text()='Connection_errors_accept']/field[@name='Value']/text()": cannot parse xml value: Start tag expected, '<' not found
parser error : Start tag expected, '<' not found
noname.xml:1: parser error : Start tag expected, '<' not found
noname.xml:1: parser error : 81668:20210318:095154.824 End of zbx_ipc_client_send():SUCCEED
noname.xml:1: parser error : Start tag expected, '<' not found
Это при debug level 4
При дефолтном debuglevel 3 - ошибки обрезаются и на выходе ошибки выглядт так:

Первым делом полез в конфиги править сокет, но там всё хорошо.
Сервер переносил с версии 4.2 на 5.2, сделав dump базы, а потом развернув ее на новом сервере.
Куда копать? Ткните носом, пожалуйста.
noname.xml:1: parser error : Start tag expected, '<' not found
1. Failed: cannot extract XML value with xpath "/resultset/row[field/text()='Connection_errors_select']/field[@name='Value']/text()": cannot parse xml value: Start tag expected, '<' not found
1. Failed: cannot extract XML value with xpath "/resultset/row[field/text()='Connection_errors_tcpwrap']/field[@name='Value']/text()": cannot parse xml value: Start tag expected, '<' not found
noname.xml:1: parser error : Start tag expected, '<' not found
noname.xml:1: parser error : Start tag expected, '<' not found
1. Failed: cannot extract XML value with xpath "/resultset/row[field/text()='Connection_errors_max_connections']/field[@name='Value']/text()": cannot parse xml value: Start tag expected, '<' not found
1. Failed: cannot extract XML value with xpath "/resultset/row[field/text()='Connection_errors_peer_address']/field[@name='Value']/text()": cannot parse xml value: Start tag expected, '<' not found
noname.xml:1: parser error : Start tag expected, '<' not found
1. Failed: cannot extract XML value with xpath "/resultset/row[field/text()='Connection_errors_internal']/field[@name='Value']/text()": cannot parse xml value: Start tag expected, '<' not found
noname.xml:1: parser error : Start tag expected, '<' not found
noname.xml:1: parser error : 81668:20210318:095154.819 In preprocessor_add_result()
noname.xml:1: parser error : Start tag expected, '<' not found
noname.xml:1: parser error : Start tag expected, '<' not found
noname.xml:1: parser error : 81671:20210318:095154.822 worker_preprocess_value: FAIL Preprocessing failed for: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.so...
1. Failed: cannot extract XML value with xpath "/resultset/row[field/text()='Connection_errors_accept']/field[@name='Value']/text()": cannot parse xml value: Start tag expected, '<' not found
parser error : Start tag expected, '<' not found
noname.xml:1: parser error : Start tag expected, '<' not found
noname.xml:1: parser error : 81668:20210318:095154.824 End of zbx_ipc_client_send():SUCCEED
noname.xml:1: parser error : Start tag expected, '<' not found
Это при debug level 4
При дефолтном debuglevel 3 - ошибки обрезаются и на выходе ошибки выглядт так:
Первым делом полез в конфиги править сокет, но там всё хорошо.
Сервер переносил с версии 4.2 на 5.2, сделав dump базы, а потом развернув ее на новом сервере.
Куда копать? Ткните носом, пожалуйста.

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