t( $known_staging['constants'] ) ) {
			foreach ( $known_staging['constants'] as $constant ) {
				if ( defined( $constant ) && constant( $constant ) ) {
					$is_staging = true;
				}
			}
		}

		// Last, let's check if sync is erroring due to an IDC. If so, set the site to staging mode.
		if ( ! $is_staging && method_exists( 'Automattic\\Jetpack\\Identity_Crisis', 'validate_sync_error_idc_option' ) && \Automattic\Jetpack\Identity_Crisis::validate_sync_error_idc_option() ) {
			$is_staging = true;
		}

		/**
		 * Filters is_staging_site check.
		 *
		 * @since 1.1.1
		 * @since-jetpack 3.9.0
		 *
		 * @param bool $is_staging If the current site is a staging site.
		 */
		$is_staging = apply_filters( 'jetpack_is_staging_site', $is_staging );

		Cache::set( 'is_staging_site', $is_staging );
		return $is_staging;
	}

	/**
	 * Whether the site is currently onboarding or not.
	 * A site is considered as being onboarded if it currently has an onboarding token.
	 *
	 * @since-jetpack 5.8
	 *
	 * @access public
	 * @static
	 *
	 * @return bool True if the site is currently onboarding, false otherwise
	 */
	public function is_onboarding() {
		return \Jetpack_Options::get_option( 'onboarding' ) !== false;
	}

	/**
	 * Whether the site is currently private or not.
	 * On WordPress.com and WoA, sites can be marked as private
	 *
	 * @since 1.16.0
	 *
	 * @return bool True if the site is private.
	 */
	public function is_private_site() {
		$ret = Cache::get( 'is_private_site' );
		if ( null === $ret ) {
			$is_private_site = '-1' === get_option( 'blog_public' );

			/**
			 * Filters the is_private_site check.
			 *
			 * @since 1.16.1
			 *
			 * @param bool $is_private_site True if the site is private.
			 */
			$is_private_site = apply_filters( 'jetpack_is_private_site', $is_private_site );

			Cache::set( 'is_private_site', $is_private_site );
			return $is_private_site;
		}
		return $ret;
	}

	/**
	 * Whether the site is currently unlaunched or not.
	 * On WordPress.com and WoA, sites can be marked as "coming soon", aka unlaunched
	 *
	 * @since 1.16.0
	 *
	 * @return bool True if the site is not launched.
	 */
	public function is_coming_soon() {
		$ret = Cache::get( 'is_coming_soon' );
		if ( null === $ret ) {
			$is_coming_soon = (bool) ( function_exists( 'site_is_coming_soon' ) && \site_is_coming_soon() )
				|| get_option( 'wpcom_public_coming_soon' );

			/**
			 * Filters the is_coming_soon check.
			 *
			 * @since 1.16.1
			 *
			 * @param bool $is_coming_soon True if the site is coming soon (i.e. unlaunched).
			 */
			$is_coming_soon = apply_filters( 'jetpack_is_coming_soon', $is_coming_soon );

			Cache::set( 'is_coming_soon', $is_coming_soon );
			return $is_coming_soon;
		}
		return $ret;
	}

	/**
	 * Returns the site slug suffix to be used as part of Calypso URLs.
	 *
	 * Strips http:// or https:// from a url, replaces forward slash with ::.
	 *
	 * @since 1.6.0
	 *
	 * @param string $url Optional. URL to build the site suffix from. Default: Home URL.
	 *
	 * @return string
	 */
	public function get_site_suffix( $url = '' ) {
		// On WordPress.com, site suffixes are a bit different.
		if ( method_exists( 'WPCOM_Masterbar', 'get_calypso_site_slug' ) ) {
			return WPCOM_Masterbar::get_calypso_site_slug( get_current_blog_id() );
		}

		// Grab the 'site_url' option for WoA sites to avoid plugins to interfere with the site
		// identifier (e.g. i18n plugins may change the main url to '<DOMAIN>/<LOCALE>', but we
		// want to exclude the locale since it's not part of the site suffix).
		if ( ( new Host() )->is_woa_site() ) {
			$url = \site_url();
		}

		if ( empty( $url ) ) {
			// WordPress can be installed in subdirectories (e.g. make.wordpress.org/plugins)
			// where the 'site_url' option points to the root domain (e.g. make.wordpress.org)
			// which could collide with another site in the same domain but with WordPress
			// installed in a different subdirectory (e.g. make.wordpress.org/core). To avoid
			// such collision, we identify the site with the 'home_url' option.
			$url = \home_url();
		}

		$url = preg_replace( '#^.*?://#', '', $url );
		$url = str_replace( '/', '::', $url );

		return rtrim( $url, ':' );
	}
}