'''
Pivots a key's value to be the key for another key.
In this example it pivots the value of key `sensor`
to be the key of the value in key `value`

Input: 
temperature sensor=001A0,value=111.48

Output: 
temperature 001A0=111.48
'''
 
 def apply(metric):
   metric.fields[str(metric.fields['sensor'])] = metric.fields['value']
   metric.fields.pop('value',None)
   metric.fields.pop('sensor',None)
   return metric