Thanks for the feedback Mike. I probably could have done a better job of providing a fully canonical config. I mention that I added the config in telegraf from a previous post here. My full config for telegraf is as follows

$ cat /etc/telegraf/telegraf.conf
[global_tags]
[agent]
  interval = "10s"
  round_interval = true
  metric_batch_size = 1000
  metric_buffer_limit = 10000
  collection_jitter = "3s"
  flush_interval = "10s"
  flush_jitter = "0s"
#  logfile = "/var/log/telegraf.log"
  precision = ""
#  debug = true
  hostname = ""
  omit_hostname = false
[[outputs.influxdb]]
  urls = ["http://192.168.1.30:8086"]
  database = "rpi_monitoring"
  username = "rpi"
  password = "thesearenotthedroidsyouarelookingfor"
[[inputs.cpu]]
  percpu = true
  totalcpu = true
  collect_cpu_time = false
  report_active = false
[[inputs.disk]]
  ignore_fs = ["tmpfs", "devtmpfs", "devfs", "iso9660", "overlay", "aufs", "squashfs"]
[[inputs.mem]]
[[inputs.swap]]
[[inputs.file]]
  files = ["/sys/class/thermal/thermal_zone0/temp"]
  name_override = "cpu_temperature"
  data_format = "value"
  data_type = "integer"
[[inputs.exec]]
  commands = [ "/opt/vc/bin/vcgencmd measure_temp" ]
  name_override = "gpu_temperature"
  data_format = "grok"
  grok_patterns = ["%{NUMBER:value:float}"]
[[inputs.net]]
  interfaces = ["eth0"]
[[inputs.netstat]]
[[inputs.ping]]
  urls = ["www.google.com"] # required
  count = 4
  interface = "eth0"
  name_override = "google_ping"
[[inputs.dns_query]]
  servers = ["8.8.8.8"]
  domains = ["."]
  record_type = "A"
  timeout = 10
  name_override = "google_dns"
[[inputs.kernel]]
[[inputs.system]]
[[inputs.processes]]
[[inputs.diskio]]

The start script on raspberry pi looks for configs in the /etc/telegraf/telegraf.d directory. I chose to use this for the pi-hole stuff.

The I have the piholestats config for telegraf here

$ cat /etc/telegraf/telegraf.d/telegraf.piholestats.conf 
[[inputs.exec]]
  commands = ["/usr/local/bin/piholestats"]
  precision = "1ms"
  name_override = "piholestats"
  data_format = "csv"
  timeout = "5s"
  csv_header_row_count=0
  csv_column_names = ["timestamp","type","status","domain","client","forward","id"]
  csv_delimiter = "|"
  csv_tag_columns = ["domain","client","forward","type","status"]
  csv_timestamp_column = "timestamp"
  csv_timestamp_format = "unix_ms"

You must have the first file setup above or at a minimum the [[outputs.influxdb]] section. Let me know if that helps.