Emit SSE: execution_payload_gossip

[dknopik]

Proposed Changes

Emit execution_payload_gossip on successful gossip verification of an execution payload. This is done as last step inside the verification function.

Additional information

This is following the established pattern for other SSEs, e.g.:

lighthouse/beacon_node/beacon_chain/src/block_verification.rs

Lines 1024 to 1032 in 95b99ee

	// Beacon API block_gossip events
	if let Some(event_handler) = chain.event_handler.as_ref()
	&& event_handler.has_block_gossip_subscribers()
	{
	event_handler.register(EventKind::BlockGossip(Box::new(BlockGossip {
	slot: block.slot(),
	block: block_root,
	})));
	}

Builds upon #9053.

[eserilev]

LGTM!

[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-03-31 14:47 UTC · Rule: default
• ✅ Checks passed · on draft merge queue: embarking unstable (37a948c) and #9063 together #9066
• ✅ Merged — 2026-03-31 15:16 UTC · at f1331ab89bc687a7a4ec95eae7e4c8282dcc2a46

This pull request spent 29 minutes 22 seconds in the queue, including 27 minutes 19 seconds running CI.

Required conditions to merge

• #approved-reviews-by >= 1 [🛡 GitHub branch protection]
  • Emit SSE: execution_payload_gossip #9063
• #changes-requested-reviews-by = 0 [🛡 GitHub branch protection]
  • Emit SSE: execution_payload_gossip #9063
• check-success=local-testnet-success
• check-success=test-suite-success