Steps to reproduce:
Configure a network discovery operation with an action that has an operation that deletes host tags from the database.

For example, testDiscoveryRules_opDelHostTags() in ui/tests/integration/testDiscoveryRules.php may be used.

Result:
The tags are deleted, but the warning message appears in Zabbix server log:

686515:20240627:173633.027 failed to delete tags from a discovered host, hostid = 10633

An audit log entry saying that the tags are deleted is not added.

Expected:
No warning message is written. The audit log entry is written.

Cause:
In discovered_host_tags_save(), this condition is used

if (ZBX_DB_OK == zbx_db_execute("%s", sql))

instead of this one

if (ZBX_DB_OK <= zbx_db_execute("%s", sql))

zbx_db_execute() returns the number of rows affected. For 2 deleted tags, it would return 2.

ZBX_DB_OK == 0