Telegraf multiple input to multiple influxdb v2 buckets

Telegraf
2

There is a very similar question here. Anyway, leave your inputs as they are, adding the tag bucket="bucket1", bucket="bucket2" and bucket="bucket3". Then you can use

[[outputs.influxdb_v2]]
  urls = ["http://127.0.0.1:8086"]
  token = "xxxxxxx"
  organization = "xxxxxx"
  bucket = "bucket_for_remaining_data"
  bucket_tag = "bucket"
  exclude_bucket_tag = false
  user_agent = "telegraf_bucket1"

The output plugin will then use the value of the tag bucket to determine which bucket to use. This only works for influxdb_v2. Alternatively, you can create three output instances and use metric filtering

[[outputs.influxdb_v2]]
  urls = ["http://127.0.0.1:8086"]
  token = "xxxxxxx"
  organization = "xxxxxx"
  bucket = "bucket1"
  user_agent = "telegraf_bucket1"
  
  [outputs.influxdb_v2.tagpass]
    bucket = ["bucket1"]

[[outputs.influxdb_v2]]
  urls = ["http://127.0.0.1:8086"]
  token = "xxxxxxx"
  organization = "xxxxxx"
  bucket = "bucket2"
  user_agent = "telegraf_bucket1"
  
  [outputs.influxdb_v2.tagpass]
    bucket = ["bucket2"]

[[outputs.influxdb_v2]]
  urls = ["http://127.0.0.1:8086"]
  token = "xxxxxxx"
  organization = "xxxxxx"
  bucket = "bucket3"
  user_agent = "telegraf_bucket1"
  
  [outputs.influxdb_v2.tagpass]
    bucket = ["bucket3"]