apollo_network_benchmark: add RoundRobin mode to enum and round_duration_seconds arg

[sirandreww-starkware]

Note

Low Risk
Low risk: changes are limited to CLI argument parsing and a simple conditional that treats RoundRobin like AllBroadcast; no core network/protocol logic is modified.

Overview
Adds a new stress-test Mode::RoundRobin (--mode rr) plus a --round-duration-seconds user arg (default 3) intended to control per-node broadcast rotation.

Updates BroadcastNetworkStressTestNode::should_broadcast so RoundRobin nodes are allowed to broadcast (same behavior as AllBroadcast).

^{Written by Cursor Bugbot for commit 04b68d7. This will update automatically on new commits. Configure here.}

[reviewable-StarkWare]

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[sirandreww-starkware]

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• apollo_network_benchmark: implement RoundRobin broadcasting logic #11560 : 3 dependent PRs (#11561 , #12722 , #13288 )
• apollo_network_benchmark: add seconds_since_epoch helper function #11559
• apollo_network_benchmark: add RoundRobin mode to enum and round_duration_seconds arg #11558 👈 (View in Graphite)
• apollo_network_benchmark: add message index detection mechanism #11557
• apollo_network_benchmark: add MessageIndexTracker struct #11556
• apollo_network_benchmark: add ReveresedSqmr receiver and registration #11555
• apollo_network_benchmark: add ReveresedSqmrSender struct and implementation #11554
• apollo_network_benchmark: add ReveresedSqmr variant to NetworkProtocol enum #11553
• apollo_network_benchmark: add Sqmr variant to MessageReceiver and registration #11552
• apollo_network_benchmark: add Sqmr variant to MessageSender with send logic #11551
• apollo_network_benchmark: add Sqmr variant to NetworkProtocol enum #11550
• apollo_network_benchmark: add SQMR protocol constant #11549
• apollo_network_benchmark: added ping latency metrics #11548
• apollo_network_benchmark: added network event metrics #11547
• apollo_network_benchmark: added SQMR session metrics #11546
• apollo_network_benchmark: added broadcast topic metrics #11545
• apollo_network_benchmark: added network metrics to network manager #11544
• apollo_network_benchmark: added broadcast metrics tracking #11543
• apollo_network_benchmark: added conditional broadcasting based on mode #11542
• apollo_network_benchmark: added broadcasting mode selection #11541
• apollo_network_benchmark: added message broadcasting task #10734 : 1 other dependent PR (#8303 )
• apollo_network_benchmark: added register metrics #10660 : 1 other dependent PR (#10661 )
• main

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

[cursor]

RoundRobin mode behaves identically to AllBroadcast mode

Medium Severity

Mode::RoundRobin is grouped with Mode::AllBroadcast in should_broadcast, making all nodes broadcast simultaneously. This means selecting --mode rr produces identical behavior to --mode all — no turn-taking occurs and round_duration_seconds is never consulted anywhere. Users of this mode will get misleading behavior with no indication that round-robin isn't actually happening.