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492b842929
Recent seastar update included RPC metrics (scylladb/seastar#1753). The reported metrics groups together sockets based on their "metrics_domain" configuration option. This patch makes use of this domain to make scylla metrics sane. The domain as this patch defines it includes two strings: First, the datacenter the server lives in. This is because grouping metrics for connections to different datacenters makes little sense for several reasons. For example -- packet delays _will_ differ for local-DC vs cross-DC traffic and mixing those latencies together is pointless. Another example -- the amount of traffic may also differ for local- vs cross-DC connections e.g. because of different usage of enryption and/or compression. Second, each verb-idx gets its own domain. That's to be able to analyze e.g. query-related traffic from gossiper one. For that the existing isolation cookie is taken as is. Note, that the metrics is _not_ per-server node. So e.g. two gossiper connections to two different nodes (in one DC) will belong to the same domain and thus their stats will be summed when reported. Signed-off-by: Pavel Emelyanov <xemul@scylladb.com> Closes scylladb/scylladb#15785