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https://issues.jenkins-ci.org/browse/JENKINS-13556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=163093#comment-163093
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Jason Howk commented on JENKINS-13556:
--------------------------------------
It's the ConsoleNote class that's attempting to mark it up. See Jenkins-13865.
> Unprintable character in executor name in JSON API output
> ---------------------------------------------------------
>
> Key: JENKINS-13556
> URL: https://issues.jenkins-ci.org/browse/JENKINS-13556
> Project: Jenkins
> Issue Type: Bug
> Components: jenkinswalldisplay
> Affects Versions: current
> Reporter: Chad Myers
>
> After upgrading to the 1.460 version of Jenkins, we noticed that when a build
> was waiting for an executor, if you hovered over the build in the wall
> display, it would say "Waiting for next available executor on
> [ESC][8mha:AAAAiR+LCAAAAAAAAABb85aBtbiIQSajNKU4P08vOT+vOD8nVc+jsiC1KCczL9svvyT1dMUiOWdZ/mImBiZPBrac1Lz0kgwfBubSopwSBiGfrMSyRP2cxLx0/eCSosy8dOuKIgYpNOOcITTIMAYIYGRiYKgoALFKGLj0k/NzC0pLUov0ATz5UcyPAAAA[ESC][0m"
> The [ESC] was actually the ASCII/ANSI escape character 0x1B.
> When we attempt to use the JSON API to get the status of builds, our script
> (Ruby) fails to parse the JSON due to invalid escape characters in the string:
> "why":"Waiting for next available executor on
> [8mha:AAAAiR+LCAAAAAAAAABb85aBtbiIQSajNKU4P08vOT+vOD8nVc+jsiC1KCczL9svvyT1dMUiOWdZ/mImBiZPBrac1Lz0kgwfBubSopwSBiGfrMSyRP2cxLx0/eCSosy8dOuKIgYpNOOcITTIMAYIYGRiYKgoALFKGLj0k/NzC0pLUov0ATz5UcyPAAAA[0m"
> Before the [8mha and the [0m there is the invisible 0x1B escape character.
> When we click on the waiting build in the UI to view the build details, it
> says (correctly) "#1849 (pending - Waiting for next available executor on
> master )"
> "master" is the name of our primary build server/executor.
> I have no idea where the big [8mhz:AAAAiR... stuff is coming from.
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