I have an influxdb/http server behind an Apache https reverse proxy.
I am really happy with this config, the ssl certs are from Letsencrypt, and my clients use https for data insertion, with curl from linux, with native libraries with Arduino clients.
Here an example with ESP8266 and arduino: https://github.com/bigjohnson/ESP_influxdbSSL_CAcert_DHT22_WiFiManager
I noticed that the Telegraf Influxdb plugin is only HTTP, I read some post that an old version was https.
I use Telegraf to collect snmp/smartctl data.
Why not re enable the https that is more secure?