title: Google EarthEngine: Getting time series for reduceRegion
body: <p>I am working with Google EarthEngine (Python API, but that does not really matter). I have an ImageCollection that I need to reduce by Region for every single image in the collection. </p>
  
  <p>Is there a way to get a time series for .reduceRegion with a single request to the EarthEngine. So far I figured out that .reduceRegion('mean', feature) works only on images. I need an equivalent to collection.reduceRegion('mean', feature) -- which does not exist -- with the goal to get a list of values for every time step.</p>
  
  <p>The underlying problem is, I am running into the request limit of the EE (3 per seconds) while creating my time series. In addition, it is very slow to issue a request for every single value.</p>
  
  <p>Is there a way to construct an appropriate reducer for collections. Since collection reducers need to return images (pls tell me if that is incorrect), I could imagine e.g. to create an image with one band per image in the input collection that has only one pixel with the desired value.</p>
  
  <p>Thank you for your help</p>