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: importer.rs
    path of file: ./repos/fuel-core/crates/services/importer/src
    
    the code of the file until where you have to start completion: use crate::{
    ports,
    ports::{
        BlockVerifier,
        Executor,
        ImporterDatabase,
    },
    Config,
};
use fuel_core_metrics::importer::importer_metrics;
use fuel_core_storage::{
    not_found,
    transactional::StorageTransaction,
    Error as StorageError,
};
use fuel_core_types::{
    blockchain::{
        consensus::{
            Consensus,
            Sealed,
        },
        primitives::BlockId,
        SealedBlock,
    },
    fuel_types::{
        BlockHeight,
        ChainId,
    },
    services::{
        block_importer::{
            ImportResult,
            SharedImportResult,
            UncommittedResult,
        },
        executor,
        executor::ExecutionResult,
        Uncommitted,
    },
};
u
    
    pub fn init_metrics(&self) {
        // load starting values from database

        // Errors are optimistically handled via fallback to default values since the metrics
        // should get updated regularly anyways and these errors will be discovered and handled
        // correctly in more mission critical areas (such as _commit_result)
        let current_block_height = self
            .database
            .latest_block_height()
            .unwrap_or_default()
            .unwrap_or_default();
        importer_metrics()
            .block_height
            .set(*current_block_height.deref() as i64);
        // on init just set to current time since it's not worth tracking in the db
        let current_time = SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .unwrap()
            .as_secs_f64();
        importer_metrics()
            .latest_block_import_timestamp
            .set(current_time);
    }