configuration: allow empty tags to mean no tag desired #791
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This allows you to use
tag ""
in the config file to avoidinferring a tag.
This is useful for example in cluster mode with phased restarts
where you might want the master process to just specify the puma
version and nothing else.
Later in
on_worker_boot
you would manually modify the processtitle to suit your needs if you need more specific tags.