That curve shows ping statistics from the WAN port to (most probably) Google DNS 8.8.8.8.
So I would probably assume something between the MX and upstream is dropping icmp packets.
Aside from checking L1 at the MX (verify cabling is properly connected, no damage to cables, no dirt on SFP/fiber connectors), I'd open a ticket with your service provider, to verify it isn't something on their end.
However, unless you or your users are experiencing any degraded service, I'd probably just leave it alone and monitor.
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