From c344023798b201e34311eba1febbd8f1fcc67673 Mon Sep 17 00:00:00 2001
From: Hector Hernandez <39923391+hectorhdzg@users.noreply.github.com>
Date: Fri, 6 Dec 2024 10:26:10 -0800
Subject: [PATCH] [monitor-opentelemetry-exporter] Truncate operation name
 context tag (#31283)

### Packages impacted by this PR
@azure/monitor-opentelemetry-exporter

### Issues associated with this PR

https://github.com/microsoft/ApplicationInsights-node.js/issues/1383#issuecomment-2386384129
---
 .../src/utils/spanUtils.ts                           | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/sdk/monitor/monitor-opentelemetry-exporter/src/utils/spanUtils.ts b/sdk/monitor/monitor-opentelemetry-exporter/src/utils/spanUtils.ts
index 583cf0c355c1..0bd336414672 100644
--- a/sdk/monitor/monitor-opentelemetry-exporter/src/utils/spanUtils.ts
+++ b/sdk/monitor/monitor-opentelemetry-exporter/src/utils/spanUtils.ts
@@ -85,13 +85,17 @@ function createTagsFromSpan(span: ReadableSpan): Tags {
       const httpUrl = span.attributes[SEMATTRS_HTTP_URL];
       tags[KnownContextTagKeys.AiOperationName] = span.name; // Default
       if (httpRoute) {
-        tags[KnownContextTagKeys.AiOperationName] = `${httpMethod as string} ${
-          httpRoute as string
-        }`;
+        // AiOperationName max lenght is 1024
+        // https://github.com/MohanGsk/ApplicationInsights-Home/blob/master/EndpointSpecs/Schemas/Bond/ContextTagKeys.bond
+        tags[KnownContextTagKeys.AiOperationName] = String(
+          `${httpMethod as string} ${httpRoute as string}`,
+        ).substring(0, MaxPropertyLengths.TEN_BIT);
       } else if (httpUrl) {
         try {
           const url = new URL(String(httpUrl));
-          tags[KnownContextTagKeys.AiOperationName] = `${httpMethod} ${url.pathname}`;
+          tags[KnownContextTagKeys.AiOperationName] = String(
+            `${httpMethod} ${url.pathname}`,
+          ).substring(0, MaxPropertyLengths.TEN_BIT);
         } catch {
           /* no-op */
         }