Telemetry Aggregation

Every field added to a Trendz view has an aggregation type that controls how raw telemetry is reduced to a single value per time bucket or group. Choose the aggregation that matches the meaning of the measurement.

To change the aggregation type, click the field in the view configuration panel and select the required value.

Some devices report a monotonically increasing counter — a pulse output — rather than an instantaneous reading. A water meter, electricity meter, or gas meter are typical examples: the raw value always grows and the meaningful metric is consumption over a period, not the absolute counter.

  Raw pulse counter (always increasing):

  time  ──────────────────────────────────────▶
  value   100   150   210   290   310   400

  Delta per interval (consumption):

  time  ──────────────────────────────────────▶
  value         50    60    80    20    90

Select DELTA aggregation for such a field and Trendz will automatically compute the consumption for each time bucket at the chosen granularity.

Raw pulse counter — the value increases monotonically and is not directly useful for period analysis. After applying DELTA aggregation — each bar shows the consumption for that interval.

When DELTA is applied to a field that spans multiple devices (for example, all water meters in a building), Trendz computes the delta for each device individually and then applies SUM to combine them. The result is the total consumption at any level of your topology — city, building, floor, or apartment.

  Building (query result after DELTA + SUM):

  ┌─────────────────────────────────────────────┐
  │  Building A — total consumption: 230 L      │
  └──────────────┬──────────────────────────────┘
                 │
       ┌─────────┴──────────┐
       ▼                    ▼
  ┌─────────────┐     ┌─────────────┐
  │  Meter 1    │     │  Meter 2    │
  │  delta: 90  │     │  delta: 140 │
  └─────────────┘     └─────────────┘
                              SUM → 230