Executes a groovy script in the Hudson JVM. Typically, the script checks some conditions and changes accordingly the build result, puts badges next to the build in the build history and/or displays information on the build summary page.
The groovy script can use the variable manager, which provides access to the following objects and methods:

• hudson - the current Hudson instance.
• build - the current build.
• listener - the build listener.
• contains(file, regexp) - returns true if the given file contains a line matching regexp.
• logContains(regexp) - returns true if the build log file contains a line matching regexp.
• getMatcher(file, regexp) - returns a java.util.regex.Matcher for the first occurrence of regexp in the given file.
• getLogMatcher(regexp) - returns a java.util.regex.Matcher for the first occurrence of regexp in the build log file.
• addShortText(text) - puts a badge with a short text, using the default format.
• addShortText(text, color, background, border, borderColor) - puts a badge with a short text, using the specified format.
• addBadge(icon, text) - puts a badge with the given icon and text.
• addInfoBadge(text) - puts a badge with info icon and the given text.
• addWarningBadge(text) - puts a badge with warning icon and the given text.
• addErrorBadge(text) - puts a badge with error icon and the given text.
• createSummary(icon) - creates an entry in the build summary page and returns a summary object corresponding to this entry. You can append text to the summary object by calling its appendText methods:
      - appendText(text, escapeHtml)
      - appendText(text, escapeHtml, bold, italic, color) -
• buildUnstable() - sets the build result to UNSTABLE.
• buildFailure() - sets the build result to FAILURE.
• buildSuccess() - sets the build result to SUCCESS.

Example:

    if(manager.logContains(".*uses or overrides a deprecated API.*")) {
      manager.addWarningBadge("Thou shalt not use deprecated methods.")
      manager.createSummary("warning.gif").appendText("<h1>You have been warned!</h1>", false, false, false, "red")
      manager.buildUnstable()
    }

See Hudson Wiki for more information.