I integrated codecov into the main boinc repository and tuned settings so that there is only one comment for every pull request that get’s updated when the pull request is updated. So far only the changes regarding the content of the comment seem to be taken into account. I still see two comments although I disabled the comment for the project coverage as I only want to see the patch coverage. A recent example is this PR: https://github.com/BOINC/boinc/pull/3140
We are using Travis CI and the python codecov tool to submit coverage reports.
Latest configuration is in the repository.