Add NEXT_SSG_FETCH_METRICS flag to control fetch metrics during SSG (#…

…68378) This PR allows the users to set `process.env.NEXT_SSG_FETCH_METRICS` to output fetch metrics during SSG of a build to separate it from `NEXT_DEBUG_BUILD` which may affect other output. Co-authored-by: JJ Kasper <jj@jjsweb.site>
vercel · Aug 1, 2024 · c470e1c · c470e1c
1 parent 4d5e8ab
commit c470e1c
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/packages/next/src/build/index.ts b/packages/next/src/build/index.ts
@@ -2754,7 +2754,7 @@ export default async function build(
           // If there was no result, there's nothing more to do.
           if (!exportResult) return
 
-          if (debugOutput) {
+          if (debugOutput || process.env.NEXT_SSG_FETCH_METRICS === '1') {
             recordFetchMetrics(exportResult)
           }
 

diff --git a/packages/next/src/server/lib/patch-fetch.ts b/packages/next/src/server/lib/patch-fetch.ts
@@ -172,7 +172,9 @@ function trackFetchMetric(
   if (staticGenerationStore.requestEndedState?.ended) return
 
   const isDebugBuild =
-    !!process.env.NEXT_DEBUG_BUILD && staticGenerationStore.isStaticGeneration
+    (!!process.env.NEXT_DEBUG_BUILD ||
+      process.env.NEXT_SSG_FETCH_METRICS === '1') &&
+    staticGenerationStore.isStaticGeneration
   const isDevelopment = process.env.NODE_ENV === 'development'
 
   if (