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Clarify energy sensor statistics calculation (#1165)

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Erik Montnemery 2021-12-22 08:44:38 +01:00 committed by GitHub
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docs/core/entity/sensor.md
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@ -103,6 +103,10 @@ zero-point. When `last_reset` changes, the zero-point will be set to 0.
If last_reset is not set, the sensor's value when it was first added is used as the
zero-point when calculating `sum` statistics.
To put it in another way: the logic when updating the statistics is to update
the sum column with the difference between the current state and the previous state
unless `last_reset` has been changed, in which case don't add anything.
Example of state class `total` without last_reset:
| t | state | sum | sum_increase | sum_decrease |
@ -145,6 +149,10 @@ cycle. This state class is useful for gas meters, electricity meters, water mete
The value when the sensor reading decreases will not be used as zero-point when calculating
`sum` statistics, instead the zero-point will be set to 0.
To put it in another way: the logic when updating the statistics is to update
the sum column with the difference between the current state and the previous state
unless the difference is negative, in which case don't add anything.
Example of state class `total_increasing`:
| t | state | sum |