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The percentage of assigned leader slots in which a validator fails to produce a block, either due to being offline, misconfigured, behind on the fork, or unable to process transactions fast enough. A high skip rate indicates validator unreliability; it reduces staking rewards for both the validator and its delegators because skipped slots produce no block rewards. Solana publishes per-validator skip rates via the `getVoteAccounts` RPC method, and delegators use skip rate as a key signal when selecting validators.