没有读懂源码以前，无脑试错总是效率很低的！
1.thanos receiver报store locally for endpoint : conflict
接口返回的日志：
store locally for endpoint : conflict
code=409
thanos receiver上的debug日志：
2021-08-20_20:49:43 level=debug ts=2021-08-20T12:49:43.941114321Z caller=handler.go:351 component=receive component=receive-handler msg="failed to handle request" err="store locally for endpoint : conflict"
2021-08-20_20:57:23 level=debug ts=2021-08-20T12:57:23.414813105Z caller=writer.go:91 component=receive component=receive-writer msg="Duplicate sample for timestamp" lset="{__name__="monitorid_73569379", instance="send_client", job="xxxx"}" sample="unsupported value type"
2021-08-20_20:57:23 level=warn ts=2021-08-20T12:57:23.414856366Z caller=writer.go:135 component=receive component=receive-writer msg="Error on ingesting samples with different value but same timestamp" numDropped=1
原因是：短时间内，同样的时间戳，同样的监控项，上报了两次
2. 不填写sample中的timestamp
thanos receiver上的debug日志：
2021-08-20_20:44:49 level=debug ts=2021-08-20T12:44:49.190297867Z caller=handler.go:351 component=receive component=receive-handler msg="failed to handle request" err="store locally for endpoint : conflict"
2021-08-20_20:44:49 level=debug ts=2021-08-20T12:44:49.194313101Z caller=writer.go:94 component=receive component=receive-writer msg="Out of bounds metric" lset="{__name__="monitorid_73599067", instance="send_client", job="trpc"}" sample="unsupported value type"
2021-08-20_20:44:49 level=warn ts=2021-08-20T12:44:49.194335493Z caller=writer.go:139 component=receive component=receive-writer msg="Error on ingesting samples that are too old or are too far into the future" numDropped=1