sstables/sstables.cc uses seastar::metrics but was missing an include of
<seastar/core/metrics.hh>. It probably received this include through
some other random included Seastar header (e.g., smp.hh).
Now that we're reducing the unnecessary inclusions in Seastar (an ongoing
effort of Seastar patches), it is no longer included implicitly, and we
need to include it explicitly in sstables.cc.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Message-Id: <20220109162823.511781-1-nyh@scylladb.com>
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