Bar & Histogram

The Bar Chart view shares its axis and series model with the Line Chart — the same X-axis, Y-axis, and Series sections control how data is structured. This page covers bar-specific features: horizontal orientation, stacking, grouping by telemetry value, and value labels. For the basics (axis setup, series, color zones, mixed charts, Y-axis control) see the Line Chart page.

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By default bars are drawn vertically. To switch to a horizontal layout:

1. Open View Settings.

2. Enable Horizontal Bar mode.

Bar chart in horizontal mode. Enable Horizontal Bar in View Settings.

When a bar chart has multiple series or Y-axis fields, each series is shown side by side by default. You can switch to a stacked layout to show contribution of each series to the total.

Three modes are available:

Control the stack mode in View Settings. Stacked mode can be combined with horizontal mode.

Stacking off: series rendered side by side. Stacking on: bars stacked, absolute values. 100% stacking: relative proportions, bars always reach 100%. Control the stack mode in View Settings.

Use this pattern when a single telemetry payload contains both a numeric value and a category string, and you want to aggregate the numeric value per category.

Example payload — a machine reports the product type, the number of units produced, and the energy consumed per cycle:

{
  "ts": 1540892498884,
  "amount": 12,
  "product": "glass",
  "energy": 218
}

To build a chart showing energy consumed per product type, broken down by machine:

1. Add the product field to the Series section with aggregation UNIQ — this groups the telemetry by product value.

2. Add the energy field to the Y-axis section with aggregation SUM — this sums energy for each product group.

3. Add the Machine name field to the X-axis section — this creates one bar group per machine.

  X-axis: Machine name
  Y-axis: energy (SUM)
  Series: product (UNIQ)

  Machine A            Machine B
  ┌────┬────┬────┐    ┌────┬────┬────┐
  │    │    │    │    │    │    │    │
  │ ▓▓ │ ░░ │ ▒▒ │    │ ▓▓ │ ░░ │ ▒▒ │
  └────┴────┴────┘    └────┴────┴────┘
  glass  cup  bottle  glass  cup  bottle
  ▓▓ = glass  ░░ = cup  ▒▒ = bottle

Show or hide numeric value labels on each bar:

1. Open View Settings.

2. Toggle the Labels checkbox.