You can retrieve a lot of information from Edirectory Performance Counters.
SUN's and some other Vendor's have a cn=monitor container for statistics.
ldapsearch -LLL -h 192.168.1.4 -b "" -s base -D cn=admin,ou=administration,dc=willeke,dc=com -W "(objectclass=*)" searchOps wholeSubtreeSearchOps oneLevelSearchOps dn: oneLevelSearchOps: 1 wholeSubtreeSearchOps: 945 searchOps: 960
ldapsearch -LLL -h 192.168.1.4 -b "" -s base -D cn=admin,ou=administration,dc=willeke,dc=com -W "(objectclass=*)" strongAuthBinds simpleAuthBinds unAuthBinds dn: unAuthBinds: 3 simpleAuthBinds: 13 strongAuthBinds: 0
ldapsearch -h ldapserver.willeke.com -p636 -e C:\mydata\treerootcert.der -b "" -s base -D cn=admin,ou=administration,dc=willeke,dc=com -w secretpwd "(objectclass=*)" chainings removeEntryOps referralsReturned listOps modifyRDNOps repUpdatesIn repUpdatesOut strongAuthBinds addEntryOps compareOps wholeSubtreeSearchOps modifyEntryOps searchOps errors simpleAuthBinds inOps oneLevelSearchOps inBytes abandonOps bindSecurityErrors securityErrors unAuthBinds outBytes extendedOps readOps dsaName directoryTreeName vendorVersion vendorName # dn: vendorName: Novell, Inc. vendorVersion: LDAP Agent for Novell eDirectory 8.8 SP2 (20216.51) directoryTreeName: willeketree dsaName: cn=ldapserver,ou=services,dc=willeke,dc=com readOps: 88723 extendedOps: 852 outBytes: 79936509 unAuthBinds: 3 securityErrors: 4 bindSecurityErrors: 4 abandonOps: 4 inBytes: 24976818 oneLevelSearchOps: 20811 inOps: 149230 simpleAuthBinds: 12544 errors: 117 searchOps: 109547 modifyEntryOps: 106 wholeSubtreeSearchOps: 11 compareOps: 1 addEntryOps: 1 strongAuthBinds: 0 repUpdatesOut: 0 repUpdatesIn: 0 modifyRDNOps: 0 listOps: 0 referralsReturned: 0 removeEntryOps: 0 chainings: 0