Inquiry increased work load

Hi,
Is there an automatic upgrade/patch that happened last March 24 2015 (1pm) EST Timezone? I'm getting an incremental increase of CPU load starting from the date and time I specified, I didn't change any settings in observium application even in the cronjobs.
Output of: ps aux | sort -nrk 3 | head
root 12585 8.5 0.0 4612 696 ? R 02:12 0:00 /usr/bin/snmpbulkwalk - xxx -OQUs -m CISCO-IPSEC-FLOW-MONITOR-MIB -M /opt/observium/mibs udp:xxxxxxx:161 cipSecGlobalStats
root 12546 7.0 0.0 4748 1540 ? R 02:12 0:00 /usr/bin/snmpwalk -v1 -c -OQUs -m SNMPv2-MIB -M /opt/observium/mibs/rfc:/opt/observium/mibs/net-snmp udp:xxxxxxx:161 snmp
root 12581 6.5 0.0 4880 1744 ? R 02:12 0:00 /usr/bin/snmpget -v1 -c -Otv -M /opt/observium/mibs udp:xxxxxx:161 sysUpTime.0
root 12579 6.0 0.0 4932 1828 ? R 02:12 0:00 /usr/bin/snmpbulkwalk -r 0 -v2c -c -OqsX -m BRIDGE-MIB -M /opt/observium/mibs/rfc:/opt/observium/mibs/net-snmp udp:xxxxxx:161 dot1dTpFdbEntry
root 12573 6.0 0.0 0 0 ? R 02:12 0:00 [snmpbulkwalk]
root 12571 6.0 0.0 5008 1888 ? R 02:12 0:00 /usr/bin/snmpbulkwalk -v2c -c -OQUn -M /opt/observium/mibs udp:xxxxx:161 .1.3.6.1.4.1.9.9.13.1
root 12569 6.0 0.0 4748 1668 ? R 02:12 0:00 /usr/bin/snmpbulkwalk -r 0 -v2c -c -OqsX -m BRIDGE-MIB -M /opt/observium/mibs/rfc:/opt/observium/mibs/net-snmp udp:xxxxxxx:161 dot1dTpFdbEntry
root 12582 5.5 0.0 4924 1968 ? R 02:12 0:00 /usr/bin/snmpbulkwalk -v2c -c -OQUs -m IF-MIB -M /opt/observium/mibs/rfc:/opt/observium/mibs/net-snmp udp:xxxxx:161 ifEntry
root 12539 5.3 0.0 5016 1884 ? R 02:12 0:00 /usr/bin/snmpbulkwalk -v2c -c -OQUs -m CISCO-VLAN-MEMBERSHIP-MIB -M /opt/observium/mibs/rfc:/opt/observium/mibs/net-snmp:/opt/observium/mibs/cis co udp:xxxxxx:161 vmVlan
root 12557 5.0 0.0 5016 1872 ? R 02:12 0:00 /usr/bin/snmpbulkwalk -v2c -c -OQUs -m CISCO-VLAN-MEMBERSHIP-MIB -M /opt/observium/mibs/rfc:/opt/observium/mibs/net-snmp:/opt/observium/mibs/cis co udp:xxxxxx:161 vmVlan
Note: xxxxx is used to replaced sensitive information
Kindly see attached screenshot for the incremental increase of CPU load that happend last Match 24 1pm (EST Timezone)
Best Regards,
Jerico M. Rubion | 77GSI IT Services Group
SEVEN SEVEN GLOBAL SERVICES INC. | 27th Floor, Orient Square Bldg., F. Ortigas Jr. Ortigas Center, Pasig City, Philippines 1605
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Jerico M. Rubion