You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: validator.rs
    path of file: ./repos/solana/core/src
    
    the code of the file until where you have to start completion: //! The `validator` module hosts all the validator microservices.

pub use solana_perf::report_target_features;
use {
    crate::{
        accounts_hash_verifier::AccountsHashVerifier,
        admin_rpc_post_init::AdminRpcRequestMetadataPostInit,
        banking_trace::{self, BankingTracer},
        cache_block_meta_service::{CacheBlockMetaSender, CacheBlockMetaService
    
fn maybe_cluster_restart_with_hard_fork(config: &ValidatorConfig, root_slot: Slot) -> Option<Slot> {
    // detect cluster restart (hard fork) indirectly via wait_for_supermajority...
    if let Some(wait_slot_for_supermajority) = config.wait_for_supermajority {
        if wait_slot_for_supermajority == root_slot {
            return Some(wait_slot_for_supermajority);
        }
    }

    None
}