Hi Brian,
         I'm attaching responses for the previously mentioned queries. The 
only differences between query1 and query2 are start and end timestamps.
Lets say for a particular timestamp *1731304830 *(present in both the json 
files)

*Query1 (5 seconds window) *returns a value *764.0958754210372*
*Query2 (60 seconds window) *returns a value *42.8*

As per my use case, regardless of the start and end timestamp, the value 
returned should be the same, as my step frequency is 1 second in both cases
Setting *max_source_resolution=0s *also does not seem to help.
Thank you,
Kishore. 


On Wednesday, November 13, 2024 at 1:02:39 AM UTC+5:30 Brian Candler wrote:

Can you show what exactly is different in the output between the two cases, 
that you don't expect to be different?

On Tuesday 12 November 2024 at 17:13:26 UTC Kishore Kumar wrote:

Hello Prometheus Community,
          I hope the person reading this has an awesome day, and thanks for 
helping out.

I have a thanos query API endpoint, which if I query for a smaller start 
and end timestamp, it is giving a different value compared to the same 
query which has a bigger difference between start and end timestamps. I 
request to know what might be causing this unexpected behaviour? 

1) *Query with 6 second difference between start and end timestamp: *
*<endpoint>/thanosquery/api/v1/query_range?query=sum(increase(envoy_cluster_upstream_rq*
*{*
*kubernetes_namespace="sample_namespacce",*
*kubernetes_pod_name="sample_pod_name",*
*envoy_cluster_name="sample_cluster_name",*
*}[3m])/3) *
*by (kubernetes_namespace,envoy_cluster_name)*
*&start=1731304828&end=1731304833&step=1s*

2) *Query with 2 minutes difference between start and end timestamp: *
*<endpoint>/thanosquery/api/v1/query_range?query=sum(increase(envoy_cluster_upstream_rq*
*{*
*kubernetes_namespace="sample_namespacce",*
*kubernetes_pod_name="sample_pod_name",*
*envoy_cluster_name="sample_cluster_name",*
*}[3m])/3) *
*by (kubernetes_namespace,envoy_cluster_name)*
*&start=1731304800&end=1731304860&step=1s*

Thank you for your time, 
Kishore. 

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Attachment: query2_800_to_860_raw_result.json
Description: application/json

Attachment: query1_828_to_833_raw_result.json
Description: application/json

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