Every now and then, the value of active dialogs metric spikes to an erroneous huge number, messing up my otherwise beautiful grafana gauges :(

Example:

kamailio_dialog_active_dialogs 18446744073709551614 1602812239115
kamailio_dialog_early_dialogs 0 1602812239115
kamailio_dialog_expired_dialogs 2 1602812239115
kamailio_dialog_failed_dialogs 7361 1602812239115

Anybody faced the same symptoms, any clues what might be causing this?

Thanks,

--Sergiu