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Drivers no longer collect over SNMP (docs/STRUCTURE.md). A driver whose device publishes its health values under OIDs of its own declares them as SNMP_HEALTH_PROFILE: per value either scalars asked in order or a table folded by first, average or max, optionally with a pattern for text answers; memory as total with used or free, or a percentage, in KiB or bytes; and how to read the interfaces. The application polls and computes. HealthMetricsMixin.get_health_metrics now warns that it is deprecated; it goes in 5.0. Closes #32