Hi,
Telegraf does not have any input plugin to read data from InfluxDB currently.
Depending on the version of InfluxDB, if your have access to tasks, you might look at this post for example of downsampling data and copying the new data to a new bucket.
Otherwise, you might consider having two influxdb outputs in your original config, one with the raw data and another that downsamples.
Another option is to use the client libraries to read the data out and do whatever manipulation of the data you want, and then write it back into a new bucket.
