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Note
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For example, if you have multiple Windows agents and you have a job that
must run on Windows, then you could configure all your Windows agents to have
the label windows, and then tie that job to this label.
This would ensure that your job runs on one of your Windows agents, but not on
any agents without this label.
Labels do not necessarily have to represent the operating system on the agent; you can also use labels to note the CPU architecture, or that a certain tool is installed on the agent.
Multiple labels must be separated by a space. For example, windows docker would assign two labels to the agent: windows and docker.
Labels may contain any non-space characters, but you should avoid special characters such as any of these: !&|<>(), as other Jenkins features allow for defining label expressions, where these characters may be used.