What did this graph means? ICMP performance? And why there is nothing shown?
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Component | Version
--------- | -------
LibreNMS | 1.61
DB Schema | 2020_02_10_223323_create_alert_location_map_table (159)
PHP | 7.2.24-0ubuntu0.18.04.3
MySQL | 10.1.44-MariaDB-0ubuntu0.18.04.1
RRDTool | 1.7.0
SNMP | NET-SNMP 5.7.3
====================================
[OK] Composer Version: 1.10.1
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct