Method getMetricsAsString

lib/registry.js:31–81

(metrics)

	}

	async getMetricsAsString(metrics) {
		const metric =
			typeof metrics.getForPromString === 'function'
				? await metrics.getForPromString()
				: await metrics.get();

		const name = escapeString(metric.name);
		const help = `# HELP ${name} ${escapeString(metric.help)}`;
		const type = `# TYPE ${name} ${metric.type}`;
		const values = [help, type];

		const defaultLabels =
			Object.keys(this._defaultLabels).length > 0 ? this._defaultLabels : null;

		const isOpenMetrics =
			this.contentType === Registry.OPENMETRICS_CONTENT_TYPE;

		for (const val of metric.values || []) {
			let { metricName = name, labels = {} } = val;
			const { sharedLabels = {} } = val;
			if (isOpenMetrics && metric.type === 'counter') {
				metricName = `${metricName}_total`;
			}

			if (defaultLabels) {
				labels = { ...labels, ...defaultLabels, ...labels };
			}

			// We have to flatten these separately to avoid duplicate labels appearing
			// between the base labels and the shared labels
			const formattedLabels = formatLabels(labels, sharedLabels);

			const flattenedShared = flattenSharedLabels(sharedLabels);
			const labelParts = [...formattedLabels, flattenedShared].filter(Boolean);
			const labelsString = labelParts.length ? `{${labelParts.join(',')}}` : '';
			let fullMetricLine = `${metricName}${labelsString} ${getValueAsString(
				val.value,
			)}`;

			const { exemplar } = val;
			if (exemplar && isOpenMetrics) {
				const formattedExemplars = formatLabels(exemplar.labelSet);
				fullMetricLine += ` # {${formattedExemplars.join(
					',',
				)}} ${getValueAsString(exemplar.value)} ${exemplar.timestamp}`;
			}
			values.push(fullMetricLine);
		}

		return values.join('\n');
	}

	async metrics() {
		const isOpenMetrics =