Difference between revisions of "Concepts"
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A tag is an attribute of the sample. It is usually used as a way to identify where is the metrics are taken from (eg. device ID). It is also useful for filtering (eg. select all samples from this region). | A tag is an attribute of the sample. It is usually used as a way to identify where is the metrics are taken from (eg. device ID). It is also useful for filtering (eg. select all samples from this region). | ||
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Revision as of 17:51, 2 September 2019
Contents
Concepts
This page is an overview of Senfi.
Measurement, Metric, Tag
Measurement
Senfi deals with data in a time series. Each sample or record in this time series consists of:
- a timestamp indicating when the data was sampled
- a set of tags
- a set of metrics
A measurement is composed of multiple samples.
Metric
A metric is a discrete reading or unit of data. It can be produced/measured by sensors, equipment, or complex systems. An example of a metric is temperature (eg. 37). A metric may or may not have units associated (eg. degrees Celsius).
Tag
A tag is an attribute of the sample. It is usually used as a way to identify where is the metrics are taken from (eg. device ID). It is also useful for filtering (eg. select all samples from this region).
Sensor
Unlike applications like Prometheus or InfluxDB which deals purely with temporal data in a time series, Senfi associates such data with physical objects in the real world.
A sensor in Senfi represents a physical object/system of interest. A sensor may produce one or more measurements, or it may not produce any measurements. There are 3 types of sensors in Senfi:
- Managed sensors
- Sensors that produces at least one measurement
- Specialized sensors
- Sensors with special behaviour, eg. lift controller
- Unmanaged sensors
- Sensors that does not produce measurement
Site
A site represents a place whereby sensors are physically located. A site usually comprise of one or more buildings. A site in Senfi has a geographical location and usually a 3D representation. Users may choose to use the CMS to trace out the building outline and generate a quick 3D building, or they can also upload a 3D model that represents details of the building.