Feed the domain through the router observer into Stats.RecordRoute so
block decisions are attributed per domain. The bounded blocked map
(LRU-evicted at 10000 entries) feeds TrafficSnapshot.Blocked, ordered
by count, and rides the existing SSE traffic stream unchanged.
- countingConn batches per-domain attribution (32KiB/500ms) so the relay
hot path pays two atomics per I/O instead of a global mutex; Close drains
- Precompute OTel byte attributes to drop per-I/O allocations
- suffixtree: indexMap only for nodes with >=8 children; Match stays
read-only for concurrent queries
- Soft Go memory limit (128MiB default, GOMEMLIMIT/SOWER_MEMORY_LIMIT_MB
override) cuts resident memory from ~240MB to ~130MB on the default
ad/china/gfw rule sets
- Split stats.go into snapshot/eviction/counting by responsibility
wweir