wouldd opened a new issue, #7193:
URL: https://github.com/apache/incubator-devlake/issues/7193

   ### Search before asking
   
   - [X] I had searched in the 
[issues](https://github.com/apache/incubator-devlake/issues?q=is%3Aissue) and 
found no similar issues.
   
   
   ### What happened
   
   I assume that the issue I'm seeing is somehow unique to me using the 
azuredevops_go plugin and the webhook for reporting deployments from octopus. 
However the 'bug' I've identified looks to me like it would effect everyone. So 
probably the real issue is somewhere else but all I can say is that for me the 
DORA metrics are all wildly out because it relates every commit that has ever 
been made against a repo to the most recent deploy. This means the cycle time 
calculation for each commit is showing as just the age of that commit until the 
most recent deploy.
   I believe the offending line is this one: 
https://github.com/apache/incubator-devlake/blob/cb69f35b5319f57dd3d6c8534121a6ca069cd175/backend/plugins/dora/tasks/change_lead_time_calculator.go#L215C2-L215C3
   the commits_diffs table has 3 columns, commit_sha, old_commit_sha and 
new_commit_sha. For me I need the filter in this query to filter where the 
mergeSha = cd.new_commit_sha in order to work correctly.
   I've tested this in my setup and that change has the expected behaviour. 
However, I would obviously expect this to be broken for everyone doing DORA 
metrics at all, and it seems unlikely no one else noticed this. So I guess 
maybe the intention of that commits_diffs table is to have information in it 
differently and perhaps the azure plugin is populating it incorrectly?
   
   
   ### What do you expect to happen
   
   In my case I have lots of quite old 4+years minimum repos. but I've only 
just started feeding deploy events in. so I would expect only to have data for 
the relatively few new commits since this went into place. and I would expect 
the cycle time calculations for those to be right.
   
   ### How to reproduce
   
   configure a long standing repo with lots of historical commtis against it. 
create a webhook call for the most recent commit/commtis in teh repo and expect 
to see dora calculations for those commits only. However you should see that it 
links all of the old commits to the new deployment.
   Indeed when I run with a version in which I changed the above filter check 
then I get the behavior I expect. all the numbers make sense and the 
pr_cycle_time calculations show up numbers for only commits that have been 
reported as part of deployments
   
   ### Anything else
   
   Happens every time for all commits.
   
   ### Version
   
   master
   
   ### Are you willing to submit PR?
   
   - [X] Yes I am willing to submit a PR!
   
   ### Code of Conduct
   
   - [X] I agree to follow this project's [Code of 
Conduct](https://www.apache.org/foundation/policies/conduct)
   


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