import { type Config } from './config';
/**
 * Resolves the telemetry tag used as the `X-DXOS-Client-Tag` header on edge
 * requests AND as the `ctx.tag` attribute / resource on observability traces.
 *
 * Keeping a single resolver ensures the same tag identifies a session across
 * edge and telemetry tiers. Precedence:
 *
 *   1. `config.runtime.app.env.DX_TELEMETRY_TAG` — the explicit, deterministic
 *      path. Populated from `.env`/build-time by the app's config loaders.
 *   2. `process.env.DX_TELEMETRY_TAG` — Node-only, for dev/CI convenience.
 *
 * Returns `undefined` when unset; callers should no-op on undefined rather
 * than stamping empty strings.
 */
export declare const resolveTelemetryTag: (config?: Config) => string | undefined;
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