Hi! After Upgrade to php 7.2 performance is dropping, and i notice now mysqld & rrdcached exhausting my ram 
Server:
- Ubuntu 16.04
- 64 vCpu
- 16 GB Ram
top - 12:37:40 up 1 day, 3:52, 2 users, load average: 1075.99, 1061.78, 1015.85
Tasks: 4967 total, 2 running, 4348 sleeping, 0 stopped, 302 zombie
%Cpu(s): 1.2 us, 0.7 sy, 0.0 ni, 0.0 id, 98.0 wa, 0.0 hi, 0.1 si, 0.0 st
KiB Mem : 16413132 total, 342820 free, 13983068 used, 2087244 buff/cache
KiB Swap: 16777212 total, 6542352 free, 10234860 used. 694884 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
11181 mysql 20 0 37.328g 2.432g 10032 S 50.3 15.5 84:26.02 mysqld
2656 librenms 20 0 36.341g 814936 2464 S 17.4 5.0 522:53.39 rrdcached
================./daily.sh===================
root@librenms:/opt/librenms# ./daily.sh
Re-running /opt/librenms/daily.sh as librenms user
Updating to latest codebase OK
Updating Composer packages OK
Updated from cf17016 to 25954cc OK
Updating SQL-Schema OK
Updating submodules OK
Cleaning up DB OK
Fetching notifications OK
Caching PeeringDB data OK
================./validate.php===================
root@librenms:/opt/librenms# ./validate.php
====================================
Component | Version
--------- | -------
LibreNMS | 1.48.1-32-g25954cc
DB Schema | 2019_01_16_195644_add_vrf_id_and_bgpLocalAs (131)
PHP | 7.2.15-1+ubuntu16.04.1+deb.sury.org+1
MySQL | 10.3.12-MariaDB-1:10.3.12+maria~xenial
RRDTool | 1.5.5
SNMP | NET-SNMP 5.7.3
====================================
[OK] Composer Version: 1.8.4
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct
[FAIL] Discovery has not completed in the last 24 hours.
[FIX]:
Check the cron job to make sure it is running and using discovery-wrapper.py
```
[mysqld]
max_connections = 500
wait_timeout = 20000
#interactive_timeut = 21600
query_cache_size = 0
query_cache_type = 0
tmp_table_size = 32M
max_heap_table_size = 32M
performance_schema = ON
join_buffer_size = 4096
innodb_buffer_pool_size = 4G
innodb_log_file_size = 2M