/**
 * Mute-CSV writer — emits the per-pattern sample-rate control file
 * that the rate receiver reads to decide how aggressively to shed each
 * pattern's volume.
 *
 * File written: `pipelines/run/receive/rate/caps.csv`
 * (same file as the rate cap CSV, but the MUTE section uses pattern-keyed
 * `fieldSet,value` rows instead of container-keyed `container,cap` rows)
 *
 * Row format: `<pattern_hash>,<sample_rate>:<untilEpoch>:<reason>`
 *   - sample_rate = 0   → full drop (no events pass)
 *   - sample_rate = 0.1 → keep 10% (sample)
 *   - sample_rate = 1.0 → pass all (no-op, generally omitted)
 *
 * This writer is used by the L1 outcome multiplexer for `drop` and `sample`
 * outcomes. The compact outcome uses `compact-csv-writer.ts` instead —
 * compact is boolean + writes a SEPARATE file.
 *
 * For the rate cap CSV (per-container bytes cap), callers use the
 * existing `renderCsv` / `renderCsvDiff` functions in `configure-engine.ts`.
 */
export interface MuteCsvRow {
    /** Stable pattern identity (tenx_hash). */
    pattern_hash: string;
    /**
     * Fraction of events to forward (0..1).
     *   0   = full mute / drop
     *   0.1 = sample at 10%
     *   1.0 = pass (no reduction — generally omit this row)
     */
    sample_rate: number;
    /**
     * Unix epoch seconds at which this row expires. When the receiver
     * evaluates the row at or after this timestamp it treats the pattern
     * as if the row were absent. Omit for a non-expiring entry.
     */
    untilEpoch?: number;
    /** Human-readable label explaining the mute decision. */
    reason?: string;
}
/**
 * Emit a mute-CSV section from a list of per-pattern mute directives.
 *
 * Returns CSV text with header `fieldSet,value` and one row per pattern.
 * Rows are sorted by pattern_hash for deterministic diffs.
 *
 * Value grammar: `<sample_rate>:<untilEpoch>:<reason>`
 *   When `untilEpoch` is absent: `<sample_rate>::<reason>` (double colon).
 *   When both absent: `<sample_rate>`.
 *
 * sample_rate is emitted as a decimal fraction with up to 6 significant
 * digits (e.g. `0`, `0.1`, `0.05`). Leading zeros are preserved.
 */
export declare function emitMuteRows(rows: MuteCsvRow[]): string;