A TagDataPoint is the type that is expected to be the type coming out of the first module
at the beginning of a time series pipeline.
To identify the source of the sampled value, there is a property called source which is
combined with tag. The tag is commonly known as the actual sensor source of a signal.
This identifier is something the Dolittle time series software is in general not using,
and there is therefor an identity mapper that
deals with translating it into what is identified as a time series;
a ubiquitous identifier.
Typically, if consuming this type, you can expect the following payload as JSON:
{
"source": "string",
"tag": "tag",
"value": number | string | any,
"timestamp": "EPOCH in milliseconds"
}