Those widgets are capable of plotting different values of the current output of a Pipes query.
They are called snapshot widgets since they plot only the data on one output batch, rather than all the timespan.
A query like the one below would populate a chart.
=> [
"Sector 1" as type, random() as v, '#4CAF50' as __color every 1 minute
union
"Sector 2" as type, random() as v, '#3498db' as __color every 1 minute
union
"Sector 3" as type, random() as v, '#e67e22' as __color every 1 minute
union
"Sector 4" as type, random() as v, '#607D8B' as __color every 1 minute
union
"Sector 5" as type, random() as v, '#c0392b' as __color every 1 minute
]
=> v, __color by type every 1 minute
