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This bug is created as a clone of upstream ticket:
https://pagure.io/389-ds-base/issue/51000

#### Issue Description

There is some code duplication from when the BDB backend code was separated.  Here is one example where this code is found in back-ldbm/db-bdb/bdb_config.c and back-ldbm/ldbm_config.c

```
slapi_config_register_callback(SLAPI_OPERATION_SEARCH, DSE_FLAG_PREOP, dn,
                                   LDAP_SCOPE_BASE, "(objectclass=*)", ldbm_back_dbmonitor_search,
                                   (void *)li)
```

Changes regarding duplicate code are present in 389-ds-base-1.4.3.16-1.module+el8.4.0+8740+d5ec8778.x86_64 package.

Removing the duplicate code did not introduce any failures in gating tests results:
suites/monitor/monitor_test.py::test_monitor PASSED
suites/monitor/monitor_test.py::test_monitor_ldbm PASSED
suites/monitor/monitor_test.py::test_monitor_backend PASSED     

Marking as Verified:Tested.

verified:tested (see comment 3) with build https://brewweb.engineering.redhat.com/brew/buildinfo?buildID=1383684 
-> marking as VERIFIED

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (389-ds:1.4 bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:1835