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Merge #28170: p2p: adaptive connections services flags
27f260a net: remove now unused global 'g_initial_block_download_completed' (furszy) aff7d92 test: add coverage for peerman adaptive connections service flags (furszy) 6ed5360 net: peer manager, dynamically adjust desirable services flag (furszy) 9f36e59 net: move state dependent peer services flags (furszy) f9ac96b net: decouple state independent service flags from desirable ones (furszy) 97df4e3 net: store best block tip time inside PeerManager (furszy) Pull request description: Derived from #28120 discussion. By relocating the peer desirable services flags into the peer manager, we allow the connections acceptance process to handle post-IBD potential stalling scenarios. The peer manager will be able to dynamically adjust the services flags based on the node's proximity to the tip (back and forth). Allowing the node to recover from the following post-IBD scenario: Suppose the node has successfully synced the chain, but later experienced dropped connections and remained inactive for a duration longer than the limited peers threshold (the timeframe within which limited peers can provide blocks). In such cases, upon reconnecting to the network, the node might only establish connections with limited peers, filling up all available outbound slots. Resulting in an inability to synchronize the chain (because limited peers will not provide blocks older than the `NODE_NETWORK_LIMITED_MIN_BLOCKS` threshold). ACKs for top commit: achow101: ACK 27f260a vasild: ACK 27f260a naumenkogs: ACK 27f260a mzumsande: Light Code Review ACK 27f260a andrewtoth: ACK 27f260a Tree-SHA512: 07befb9bcd0b60a4e7c45e4429c02e7b6c66244f0910f4b2ad97c9b98258b6f46c914660a717b5ed4ef4814d0dbfae6e18e6559fe9bec7d0fbc2034109200953
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