1 files changed, 21 insertions, 15 deletions

diff --git a/u/trace/metrics.ts b/u/trace/metrics.ts
index f57b725..69322b9 100644
--- a/u/trace/metrics.ts
+++ b/u/trace/metrics.ts
@@ -15,9 +15,9 @@ export enum Unit {
 export interface IMetric {
   readonly count: IEmittableMetric;
   readonly time: IEmittableMetric;
-  readonly failure: IMetric;
-  readonly success: IMetric;
-  readonly warn: IMetric;
+  readonly failure?: IMetric;
+  readonly success?: IMetric;
+  readonly warn?: IMetric;
   readonly children: Supplier<Array<IMetric>>;
 
   readonly _tag: "IMetric";
@@ -52,23 +52,25 @@ export class Metric implements IMetric {
   constructor(
     public readonly count: IEmittableMetric,
     public readonly time: IEmittableMetric,
-    public readonly failure: Metric,
-    public readonly success: Metric,
-    public readonly warn: Metric,
+    public readonly failure?: Metric,
+    public readonly success?: Metric,
+    public readonly warn?: Metric,
     public readonly _tag: "IMetric" = "IMetric",
   ) {}
 
   public children() {
-    return [this.failure, this.success, this.warn];
+    return [this.failure, this.success, this.warn].filter(
+      (x) => x,
+    ) as IMetric[];
   }
 
-  static fromName(name: string): Metric {
+  static fromName(name: string, addChildren = true): Metric {
     return new Metric(
       new EmittableMetric(`${name}.count`, Unit.COUNT),
       new EmittableMetric(`${name}.elapsed`, Unit.MILLISECONDS),
-      Metric.fromName(`${name}.failure`),
-      Metric.fromName(`${name}.success`),
-      Metric.fromName(`${name}.warn`),
+      addChildren ? Metric.fromName(`${name}.failure`, false) : undefined,
+      addChildren ? Metric.fromName(`${name}.success`, false) : undefined,
+      addChildren ? Metric.fromName(`${name}.warn`, false) : undefined,
     );
   }
 }
@@ -86,7 +88,9 @@ export const isMetricValue = (t: unknown): t is MetricValue =>
 export const isMetricsTraceSupplier = (t: unknown): t is MetricsTraceSupplier =>
   isMetricValue(t) || isIMetric(t);
 
-export type MetricsTraceSupplier = ITraceWith<IMetric | MetricValue>;
+export type MetricsTraceSupplier = ITraceWith<
+  IMetric | MetricValue | undefined
+>;
 type MetricTracingTuple = [IMetric, Date];
 export class MetricsTrace implements ITrace<MetricsTraceSupplier> {
   constructor(
@@ -96,12 +100,13 @@ export class MetricsTrace implements ITrace<MetricsTraceSupplier> {
   ) {}
 
   public addTrace(trace: MetricsTraceSupplier) {
-    if (isMetricValue(trace) || typeof trace === "string") return this;
+    if (!isIMetric(trace)) return this;
     return new MetricsTrace(this.metricConsumer)._nowTracing(trace);
   }
 
   public trace(metric: MetricsTraceSupplier) {
-    if (typeof metric === "string") return this;
+    if (typeof metric === "undefined" || typeof metric === "string")
+      return this;
     if (isMetricValue(metric)) {
       this.metricConsumer([metric]);
       return this;
@@ -138,7 +143,8 @@ export class MetricsTrace implements ITrace<MetricsTraceSupplier> {
     ];
   }
 
-  private _nowTracing(metric: IMetric): MetricsTrace {
+  private _nowTracing(metric?: IMetric): MetricsTrace {
+    if (!metric) return this;
     this.tracing.push([metric, new Date()]);
     return this;
   }