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Developers often run Scylla with the default conf/scylla.yaml provided with the source distribution. The existing default listens for all ports but one (19042, 10000, 9042, 7000) on the *localhost* IP address (127.0.0.1). But just one port - 9180 (Prometheus metrics) - is listened on 0.0.0.0. This patch changes the default to be 127.0.0.1 for port 9180 as well. Note that this just changes the default scylla.yaml - users can still choose whatever listening address they want by changing scylla.yaml and/or passing command line parameters. The benefits of this patch are: 1. More consistent. 2. Better security for developers (don't open ports on external addresses while testing). 3. Allow test/cql-pytest/run to run in parallel with a default run of Scylla (currently, it fails to run Scylla on a random IP address, because the default run of Scylla already took port 9180 on all IP addresses. The third benefit is what led me to write this patch. Fixes #8757. Signed-off-by: Nadav Har'El <nyh@scylladb.com> Message-Id: <20210530130307.906051-1-nyh@scylladb.com>