Rename PassthroughMetric to LabeledMetric

Author: Dexterp37

glean/src/core/metrics/index.ts

@@ -178,13 +178,16 @@ export abstract class MetricType implements CommonMetricData {
 }
 
 /**
- * This is a no-op internal metric representation.
+ * This is an internal metric representation for labeled metrics.
  *
  * This can be used to instruct the validators to simply report
  * whatever is stored internally, without performing any specific
  * validation.
+ *
+ * This needs to live here, instead of labeled.ts, in order to avoid
+ * a cyclic dependency.
  */
-export class PassthroughMetric extends Metric<JSONValue, JSONValue> {
+export class LabeledMetric extends Metric<JSONValue, JSONValue> {
   constructor(v: unknown) {
     super(v);
   }

glean/src/core/metrics/utils.ts

@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-import { Metric, PassthroughMetric } from "./index";
+import { Metric, LabeledMetric } from "./index";
 import { JSONValue } from "../utils";
 
 import { BooleanMetric } from "./types/boolean";
@@ -20,7 +20,7 @@ const METRIC_MAP: {
   "boolean": BooleanMetric,
   "counter": CounterMetric,
   "datetime": DatetimeMetric,
-  "labeled_counter": PassthroughMetric,
+  "labeled_counter": LabeledMetric,
   "string": StringMetric,
   "uuid": UUIDMetric,
 });