v1.53.1

Fixed

• CPU and memory graphs stayed empty on most devices. The graphs added in 1.53.0 only recorded devices polled over SNMP; devices polled over SSH — usually the majority — collected nothing, because their routers report these values as 3% and 49.5MiB rather than plain numbers. Both now record on every connection method. The CPU and memory figures shown on the device card were always correct — only the history was affected. If you ran 1.53.0, the graphs start filling in about 5 minutes after upgrading; history for the hours in between was never collected and cannot be recovered.