Inconsistent result with same API call to Prometheus via client_golang

[ShipingDeng]

Hi there, we build a golang service and use client_golang to fetch data from a thanos backend. But recently we find when a request was repeatedly, some data points would be NULL sometimes but normal sometimes. Then we checked the backend by other client (grafana, thanos UI), the data series was good without any NULL, and we could not reproduce this issue except using client_golang.

Library version: v1.22.0.

We are not sure there are any possible settings influence the result, if necessary, let's provide more details.