i had this problem since i completely installed.
Component | Version
LibreNMS | 1.68-74-gc47ddd2c1
DB Schema | 2020_10_21_124101_allow_nullable_ospf_columns (187)
PHP | 7.4.10
Python | 3.6.9
MySQL | 10.1.44-MariaDB-0ubuntu0.18.04.1
RRDTool | 1.7.0
SNMP | NET-SNMP 5.7.3
[OK] Composer Version: 1.10.16
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct
RRDTool Command
rrdtool graph /tmp/0e8m317lXcONIrbE -g -l 0 -u 100 -E --start 1603588500 --end 1603674900 --width 1656 --height 300 -c BACK#EEEEEE00 -c SHADEA#EEEEEE00 -c SHADEB#EEEEEE00 -c CANVAS#FFFFFF00 -c GRID#a5a5a5 -c MGRID#FF9999 -c FRAME#5e5e5e -c ARROW#5e5e5e -R normal -c FONT#000000 --font LEGEND:8:DejaVuSansMono --font AXIS:7:DejaVuSansMono --font-render-mode normal COMMENT:‘Load % Now Min Max Avg\l’ --daemon unix:/var/run/rrdcached.sock
RRDTool Output
OK u:0.00 s:0.00 r:0.00