Document the K6_INFLUXDB_HTTP_PROXY

Author: olegbespalov

docs/sources/next/results-output/real-time/influxdb.md

@@ -69,6 +69,7 @@ Here is the full list of options that can be configured and passed to the extens
 | K6_INFLUXDB_TAGS_AS_FIELDS    | vu:int,iter:int,url   | A comma-separated string to set `k6` metrics as non-indexable fields (instead of tags). An optional type can be specified using :type as in vu:int will make the field integer. The possible field types are int, bool, float and string, which is the default. Example: vu:int,iter:int,url:string,event_time:int. |
 | K6_INFLUXDB_INSECURE          | false                 | When `true`, it will skip `https` certificate verification.                                                                                                                                                                                                                                                         |
 | K6_INFLUXDB_PRECISION         | 1ns                   | The timestamp [Precision](https://docs.influxdata.com/influxdb/v2.7/reference/glossary/#precision).                                                                                                                                                                                                                 |
+| K6_INFLUXDB_HTTP_PROXY        |                       | Sets an HTTP proxy for the InfluxDB output.                                                                                                                                                                                                                                                                         |
 
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