[WebUI] mdb database statistics don't work

[mirielka]

Description of a problem
Monitoring info on database suffix on instance with mdb database does not work.

Version-Release number of the selected component
389-ds-base-3.0.4-3.el10.x86_64
cockpit-389-ds-3.0.4-6.el10dsrv.noarch

Browser (if applicable)
Firefox

Steps to reproduce

1. Create instance with mdb database
2. Open WebUI, go to Monitoring tab
3. Go to Database -> dc=example, dc=com

Actual results
Reports "Loading Suffix Monitor Information ..." and shows Ooops!

Console output:

Uncaught TypeError: n.attrs.dncachehitratio is undefined    
refreshSuffixCache ...:9090/cockpit/@localhost/389-console/index.js:634    
l ...:9090/cockpit/@localhost/389-console/index.js:13    
c ...:9090/cockpit/@localhost/389-console/index.js:13    
i ...:9090/cockpit/@localhost/389-console/index.js:13    
setTimeout handler*s ...:9090/cockpit/@localhost/389-console/index.js:13    
c ...:9090/cockpit/@localhost/389-console/index.js:13    
d ...:9090/cockpit/@localhost/389-console/index.js:13    
resolve ...:9090/cockpit/@localhost/389-console/index.js:13    
spawn ...:9090/cockpit/@localhost/389-console/index.js:14    
TM ...:9090/cockpit/@localhost/389-console/index.js:9    
value ...:9090/cockpit/@localhost/389-console/index.js:9    
h ...:9090/cockpit/@localhost/389-console/index.js:13    
m ...:9090/cockpit/@localhost/389-console/index.js:13    
h ...:9090/cockpit/@localhost/389-console/index.js:12    
dispatch_data ...:9090/cockpit/@localhost/389-console/index.js:12    
pq ...:9090/cockpit/@localhost/389-console/index.js:9index.js:634:38379
CMD: refreshSuffixCache: Get suffix monitor ==> dsconf -j ldapi://%2fvar%2frun%2fslapd-localhost.socket monitor backend dc=example,dc=com

Expected results
Should show monitoring info

Additional information

Error also when trying to display cache statistics in CLI:

# dsconf localhost monitor dbmon
Error: list index out of range

# dsconf localhost monitor backend dc=example,dc=com
dn: cn=monitor,cn=userRoot,cn=ldbm database,cn=plugins,cn=config
readonly: 0
entrycachehits: 308
entrycachetries: 323
entrycachehitratio: 95
currententrycachesize: 49691
maxentrycachesize: 512000
currententrycachecount: 14
maxentrycachecount: -1
... (total 321 lines of output)

When clicking only "Database" in Monitoring tab without going into the suffix, it shows "Cache Hit Ratio NaN%" and all the values are empty.