Prometheus wants counter, not count

src/prometheus.ts

@@ -50,7 +50,7 @@ export class MetricsRenderer {
     render(metric: Metric): string {
         const name = this.metricName(metric.name)
         return [
-            `# TYPE ${name} ${name.endsWith('_total') ? 'count' : 'gauge'}`,
+            `# TYPE ${name} ${name.endsWith('_total') ? 'counter' : 'gauge'}`,
             `${name}${this.renderLabels(metric.labels)} ${metric.value}${
                 metric.timestamp !== null ? ' ' + String(metric.timestamp.getTime()) : ''
             }`,

tests/prometheus.test.ts

@@ -37,7 +37,7 @@ prefix_metric{label="Some Label"} 0.000001 946684800000`,
                     new Metric(metricName, 42, new Date('2000-01-01 00:00:00 UTC'), { label: 'Some Label' }),
                 ),
             ).toEqual(
-                `# TYPE prefix_some_metric_total count
+                `# TYPE prefix_some_metric_total counter
 prefix_some_metric_total{label="Some Label"} 42 946684800000`,
             )
         }