Merge pull request #2199 from SalesforceCommerceCloud/bendvc/fix-sdk-performance-util

[SDK] Fix `Performance` util class

Author: bendvc

packages/pwa-kit-react-sdk/CHANGELOG.md

@@ -1,4 +1,5 @@
 ## v3.9.0-dev (Oct 29, 2024)
+- Fix the performance logging util to not round duration. [#2199](https://github.com/SalesforceCommerceCloud/pwa-kit/pull/2199)
 - Add RedirectWithStatus component, allowing finer grained control of rediriects and their status code [#2173](https://github.com/SalesforceCommerceCloud/pwa-kit/pull/2173)
 
 ## v3.8.0 (Oct 28, 2024)

packages/pwa-kit-react-sdk/src/utils/performance.js

@@ -53,7 +53,7 @@ export default class PerformanceTimer {
     buildServerTimingHeader() {
         const header = this.metrics
             .map((metric) => {
-                return `${metric.name};dur=${metric.duration}`
+                return `${metric.name};dur=${metric.duration.toFixed(2)}`
             })
             .join(', ')
 
@@ -117,7 +117,7 @@ export default class PerformanceTimer {
             if (startMark) {
                 const measurement = {
                     name,
-                    duration: (timestamp - startMark.timestamp).toFixed(2),
+                    duration: timestamp - startMark.timestamp,
                     detail: options.detail
                 }
                 this.metrics.push(measurement)