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The RestartCount is not really suitable for use as a source of uniqueness within task invocations as it is not monotonic, and interacts with the restart stanza in a users config, so conflates restarts due to task failures, with restarts due to enviromental changes, such as consul template or vault secrets changing. Here we instead use a substring from a uuid, which is more random than we strictly need, but is nicer than rolling our own random string generator here.