In a development build (i.e. does not have the assets build tag), the
first request to GET /api/v2/swagger.json will produce log output like:
INFLUXDB_VALID_SWAGGER_PATH not set; falling back to checking relative paths {"log_id": "0E4I7Dkl000", "service": "swagger-loader"}
Successfully loaded swagger.yml {"log_id": "0E4I7Dkl000", "service": "swagger-loader", "path": "/.../influxdb/http/swagger.yml"}
There is no such log line in production builds.
But now both builds correctly serve swagger.json, instead of just
production builds.