client connection issues

[vladimir-ea]

a set of fixes from debugging client connection issues (specifically lighthouse):

• tracking of rpc request outcomes
• fix ByRoot rpc requests (previously not handled)
• monotonically increasing ENR seq across restarts
• advertise fake tcp support in ENR (otherwise Lighthouse will not call us)
• stuck streams and stream timeouts
• gossip mesh management: reduce mesh churn
• additional surfer metrics: per client counts, mark inbound connections

[vladimir-ea]

@clanky-gattaca review

[clanky-gattaca]

🤖 PR review

Large P2P/gossip reliability PR: QUIC transport keep-alive + idle timeout, stream setup/inbound-RPC idle timeouts with reset-based teardown, goodbye-before-close linger, a hard inbound connection cap, over-population trimming via TooManyPeers goodbyes, a fix for DataColumnsByRootRequest SSZ parsing (list-of-identifiers, not a bare identifier), a tcache commit fix for by-root request bodies, and P7/score-gate retuning. The peer-manager gossip domain is split into manager/gossip.rs (mostly a move, with real behaviour changes: no d_high gate on remote grafts, deterministic score-ordered mesh trimming, quick-prune backoff escalation, P5-excluded gossip gate). The functional fixes look sound and are well tested; the main thing I'd hold on is the 32× bump of the per-gossip-stream outbound ring, which multiplies to ~1 GiB of eagerly-allocated heap at the new connection cap.

Blocking (1)

• crates/network/src/p2p/quic/peer.rs:687 — OutBuffer::new eagerly allocates vec![None; len], so 32768 slots of Option<AcquiredRead> (~32 B) is ~1 MiB per gossip stream. Both the inbound and outbound gossipsub stream get one, and max_connections is now 600 (max_priority_peers 500 × 1.2), so this goes from ~38 MiB to ~1.2 GiB of resident heap at steady state.

_{8 inline comment(s) on the diff.}

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_{opus · medium effort · 365s}

Re-run — tick an effort:

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[clanky-gattaca]

Inline notes from the review comment on this PR.

[clanky-gattaca]

Inline notes from the review comment on this PR.

[clanky-gattaca]

Inline notes from the review comment on this PR.