1866521df6
pull_response_fail_inserts has been increasing: https://cdn.discordapp.com/attachments/478692221441409024/759096187587657778/pull_response_fail_insert.png but for outdated values which fail to insert: https://github.com/solana-labs/solana/blob/a5c3fc14b3/core/src/crds_gossip_pull.rs#L332-L344 https://github.com/solana-labs/solana/blob/a5c3fc14b3/core/src/crds.rs#L104-L108 are not recorded anywhere, and so the next pull request may obtain the same redundant payload again, unnecessary taking bandwidth. This commit holds on to the hashes of failed-inserts for a while, similar to purged_values: https://github.com/solana-labs/solana/blob/a5c3fc14b3/core/src/crds_gossip_pull.rs#L380 and filter them out for the next pull request: https://github.com/solana-labs/solana/blob/a5c3fc14b3/core/src/crds_gossip_pull.rs#L204
