Metric

Type: metric • Category: visualization

Description

Store latest metric value

Parameters

Name	Type	Description	Required	Default
widgetId	hidden		no
metricExpr	string	Expr -> number or {value,label}	no
keepHistory	boolean		no	false
historyLimit	number		no	100

Help

Metric Worker - Key Performance IndicatorsDisplay real-time metric values with optional historical trending and customizable formatting.

Data Source:

• metricExpr: Expression returning number or {value: number, label: string}
• keepHistory: Enable historical data tracking (default: false)
• historyLimit: Maximum historical points to retain (default: 100)

Features:

• Real-time: Always shows latest metric value
• Historical: Optional trend line with previous values
• Labels: Custom metric names and descriptions
• Formatting: Automatic number formatting
• Trending: Visual indication of value changes

Data Format:

• Simple: metricExpr="42.5" or metricExpr="data.temperature"
• With label: metricExpr="{value: data.cpu_usage, label: 'CPU %'}"

Examples:

• Temperature: metricExpr="{value: data.temp, label: 'Room Temperature °C'}"
• Counter: metricExpr="data.request_count"
• Percentage: metricExpr="{value: data.completion_rate * 100, label: 'Progress %'}"

Use Cases:

• System monitoring
• KPI dashboards
• Real-time counters
• Performance metrics