valhalla-browser API
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    Interface LoaderMetrics

    Fetch attempts and validated bytes; these are not necessarily origin network transfers. Route results contain per-route deltas; session diagnostics contain cumulative values.

    interface LoaderMetrics {
        bytes: number;
        deduplicated: number;
        metadataBytes: number;
        requests: number;
        retries: number;
        sequentialWaitMs: number;
        tileDownloads: number;
    }
    Index
    bytes: number

    Validated response-body bytes consumed by the tile loader, including its metadata reads.

    deduplicated: number

    Requests sharing an already in-flight download.

    metadataBytes: number

    Portion of bytes used by the native archive header/index, excluding JSON metadata.

    requests: number

    Tile-loader Fetch API attempts, including retries and archive index/header reads. Excludes manifest/config fetches.

    retries: number

    Additional fetch attempts after transient failures.

    sequentialWaitMs: number

    Accumulated download time in ms, including body reads, retries/backoff and integrity validation.

    tileDownloads: number

    Successfully downloaded complete tiles; evicted tiles can be downloaded again.