faizansaiyed123 · Oct 18, 2026 · Oct 18, 2026 · Oct 18, 2026 · Oct 18, 2026 · Oct 18, 2026
@@ -0,0 +1,58 @@
+import type { KVNamespace } from '@cloudflare/workers-types';
+import * as Sentry from '@sentry/cloudflare';
+
+interface Env {
+  SENTRY_DSN: string;
+  MY_KV: KVNamespace;
+}
+
+export default Sentry.withSentry(
+  (env: Env) => ({
+    dsn: env.SENTRY_DSN,
+    tracesSampleRate: 1,
+  }),
+  {
+    async fetch(request, env) {
+      const url = new URL(request.url);
+
+      if (url.pathname === '/kv/get') {
+        await env.MY_KV.put('get-key', 'get-value');
+        const value = await env.MY_KV.get('get-key');
+        return new Response(value);
+      }
+
+      if (url.pathname === '/kv/bulk-get') {
+        await env.MY_KV.put('bulk-a', 'a');
+        await env.MY_KV.put('bulk-b', 'b');
+        const values = await env.MY_KV.get(['bulk-a', 'bulk-b']);
+        return Response.json(Object.fromEntries(values));
+      }
+
+      if (url.pathname === '/kv/get-with-metadata') {
+        await env.MY_KV.put('metadata-key', 'metadata-value', { metadata: { source: 'test' } });
+        const value = await env.MY_KV.getWithMetadata('metadata-key');
+        return Response.json(value);
+      }
+
+      if (url.pathname === '/kv/put') {
+        await env.MY_KV.put('put-key', 'put-value');
+        return new Response('OK');
+      }
+
+      if (url.pathname === '/kv/list') {
+        await env.MY_KV.put('list-a', 'a');
+        await env.MY_KV.put('list-b', 'b');
+        await env.MY_KV.list({ prefix: 'list-' });
+        return new Response('OK');
+      }
+
+      if (url.pathname === '/kv/delete') {
+        await env.MY_KV.put('delete-key', 'gone');
+        await env.MY_KV.delete('delete-key');
+        return new Response('OK');
+      }
+
+      return new Response('not found', { status: 404 });
+    },
+  } as ExportedHandler<Env>,
+);
@@ -0,0 +1,163 @@
+import {
+  CACHE_HIT,
+  CACHE_KEY,
+  CACHE_OPERATION,
+  DB_COLLECTION_NAME,
+  DB_OPERATION_NAME,
+  DB_SYSTEM_NAME,
+  SENTRY_OP,
+  SENTRY_ORIGIN,
+} from '@sentry/conventions/attributes';
+import { CACHE_GET, CACHE_PUT, CACHE_REMOVE } from '@sentry/conventions/op';
+import { CACHE_OPERATION_NAMES } from '@sentry/core';
+import { expect, it } from 'vitest';
+import { createRunner } from '../../runner';
+import { getSpansFromEnvelope } from '../../spanUtils';
+
+it('emits cache.get for a KV read with key and hit attributes', async ({ signal }) => {
+  const runner = createRunner(__dirname)
+    .expect(envelope => {
+      const spans = getSpansFromEnvelope(envelope).filter(span => span.name === CACHE_GET);
+      expect(spans).toEqual(
+        expect.arrayContaining([
+          expect.objectContaining({
+            attributes: expect.objectContaining({
+              [SENTRY_OP]: { type: 'string', value: CACHE_GET },
+              [SENTRY_ORIGIN]: { type: 'string', value: 'auto.cache.cloudflare.kv' },
+              [CACHE_OPERATION]: { type: 'string', value: CACHE_OPERATION_NAMES[CACHE_GET] },
+              [CACHE_KEY]: { type: 'string', value: 'get-key' },
+              [CACHE_HIT]: { type: 'boolean', value: true },
+              [DB_OPERATION_NAME]: { type: 'string', value: 'get' },
+              [DB_COLLECTION_NAME]: { type: 'string', value: 'MY_KV' },
+              [DB_SYSTEM_NAME]: { type: 'string', value: 'cloudflare-kv' },
+            }),
+          }),
+        ]),
+      );
+    })
+    .start(signal);
+
+  await runner.makeRequest('get', '/kv/get');
+  await runner.completed();
+});
+
+it('emits cache.get for a bulk KV read with all keys in cache.key', async ({ signal }) => {
+  const runner = createRunner(__dirname)
+    .expect(envelope => {
+      const spans = getSpansFromEnvelope(envelope).filter(
+        span => span.name === CACHE_GET && span.attributes[DB_OPERATION_NAME]?.value === 'get',
+      );
+
+      expect(spans).toEqual(
+        expect.arrayContaining([
+          expect.objectContaining({
+            attributes: expect.objectContaining({
+              [CACHE_KEY]: expect.objectContaining({
+                type: 'array',
+                value: expect.arrayContaining(['bulk-a', 'bulk-b']),
+              }),
+              [CACHE_HIT]: { type: 'boolean', value: true },
+            }),
+          }),
+        ]),
+      );
+    })
+    .start(signal);
+
+  await runner.makeRequest('get', '/kv/bulk-get');
+  await runner.completed();
+});
+
+it('emits cache.get for getWithMetadata', async ({ signal }) => {
+  const runner = createRunner(__dirname)
+    .expect(envelope => {
+      const spans = getSpansFromEnvelope(envelope).filter(
+        span => span.name === CACHE_GET && span.attributes[DB_OPERATION_NAME]?.value === 'getWithMetadata',
+      );
+
+      expect(spans).toEqual([
+        expect.objectContaining({
+          attributes: expect.objectContaining({
+            [CACHE_KEY]: { type: 'string', value: 'metadata-key' },
+            [CACHE_HIT]: { type: 'boolean', value: true },
+          }),
+        }),
+      ]);
+    })
+    .start(signal);
+
+  await runner.makeRequest('get', '/kv/get-with-metadata');
+  await runner.completed();
+});
+
+it('emits cache.put for KV writes', async ({ signal }) => {
+  const runner = createRunner(__dirname)
+    .expect(envelope => {
+      const spans = getSpansFromEnvelope(envelope).filter(span => span.name === CACHE_PUT);
+      expect(spans).toEqual(
+        expect.arrayContaining([
+          expect.objectContaining({
+            attributes: expect.objectContaining({
+              [SENTRY_OP]: { type: 'string', value: CACHE_PUT },
+              [CACHE_OPERATION]: { type: 'string', value: CACHE_OPERATION_NAMES[CACHE_PUT] },
+              [CACHE_KEY]: { type: 'string', value: 'put-key' },
+              [DB_OPERATION_NAME]: { type: 'string', value: 'put' },
+            }),
+          }),
+        ]),
+      );
+    })
+    .start(signal);
+
+  await runner.makeRequest('get', '/kv/put');
+  await runner.completed();
+});
+
+it('emits cache.remove for KV deletes', async ({ signal }) => {
+  const runner = createRunner(__dirname)
+    .expect(envelope => {
+      const spans = getSpansFromEnvelope(envelope).filter(span => span.name === CACHE_REMOVE);
+      expect(spans).toEqual(
+        expect.arrayContaining([
+          expect.objectContaining({
+            attributes: expect.objectContaining({
+              [SENTRY_OP]: { type: 'string', value: CACHE_REMOVE },
+              [CACHE_OPERATION]: { type: 'string', value: CACHE_OPERATION_NAMES[CACHE_REMOVE] },
+              [CACHE_KEY]: { type: 'string', value: 'delete-key' },
+              [DB_OPERATION_NAME]: { type: 'string', value: 'delete' },
+            }),
+          }),
+        ]),
+      );
+    })
+    .start(signal);
+
+  await runner.makeRequest('get', '/kv/delete');
+  await runner.completed();
+});
+
+it('emits cache.get for KV list operations', async ({ signal }) => {
+  const runner = createRunner(__dirname)
+    .expect(envelope => {
+      const spans = getSpansFromEnvelope(envelope).filter(
+        span => span.name === CACHE_GET && span.attributes[DB_OPERATION_NAME]?.value === 'list',
+      );
+
+      expect(spans).toEqual(
+        expect.arrayContaining([
+          expect.objectContaining({
+            attributes: expect.objectContaining({
+              [SENTRY_OP]: { type: 'string', value: CACHE_GET },
+              [CACHE_OPERATION]: { type: 'string', value: CACHE_OPERATION_NAMES[CACHE_GET] },
+              [DB_OPERATION_NAME]: { type: 'string', value: 'list' },
+            }),
+          }),
+        ]),
+      );
+      expect(spans[0]?.attributes[CACHE_KEY]).toBeUndefined();
+    })
+    .start(signal);
+
+  await runner.makeRequest('get', '/kv/list');
+  await runner.completed();
+});
@@ -0,0 +1,12 @@
+{
+  "name": "worker-name",
+  "compatibility_date": "2025-06-17",
+  "main": "index.ts",
+  "compatibility_flags": ["nodejs_compat"],
+  "kv_namespaces": [
+    {
+      "binding": "MY_KV",
+      "id": "00000000000000000000000000000000",
+    },
+  ],
+}
@@ -6,6 +6,7 @@ import {
   isD1Database,
   isDurableObjectNamespace,
   isJSRPC,
+  isKVNamespace,
   isQueue,
   isR2Bucket,
 } from '../../utils/isBinding';
@@ -14,6 +15,7 @@ import { appendRpcMeta } from '../../utils/rpcMeta';
 import { createRpcPropagationResolver } from '../../utils/rpcPropagation';
 import { instrumentDurableObjectNamespace, STUB_NON_RPC_METHODS } from '../instrumentDurableObjectNamespace';
 import { instrumentFetcher } from './instrumentFetcher';
+import { instrumentKV } from './instrumentKV';
 import { instrumentQueueProducer } from './instrumentQueueProducer';
 import { instrumentR2Bucket } from './instrumentR2';
 
@@ -31,6 +33,7 @@ const instrumentedBindings = new WeakMap<object, unknown>();
  * - DurableObjectNamespace (via `idFromName` duck-typing)
  * - Service bindings / JSRPC proxies
  * - Queue producers (via `send` + `sendBatch` duck-typing)
+ * - Workers KV namespaces (via `get` + `put` + `list` + `getWithMetadata` duck-typing)
  * - R2 Buckets (via `head` + `put` + `createMultipartUpload` duck-typing)
  * - Workers AI (via `run` + `gateway` + `toMarkdown` duck-typing)
  *
@@ -71,6 +74,13 @@ export function instrumentEnv<Env extends Record<string, unknown>>(env: Env, opt
         return instrumented;
       }
 
+      if (isKVNamespace(item)) {
+        const bindingName = typeof prop === 'string' ? prop : String(prop);
+        const instrumented = instrumentKV(item, bindingName);
+        instrumentedBindings.set(item, instrumented);
+        return instrumented;
+      }
+
       if (isR2Bucket(item)) {
         const bindingName = typeof prop === 'string' ? prop : String(prop);
         const instrumented = instrumentR2Bucket(item, bindingName);

@@ -0,0 +1,110 @@
+import type { KVNamespace } from '@cloudflare/workers-types';
+import {
+  CACHE_HIT,
+  CACHE_KEY,
+  CACHE_OPERATION,
+  DB_COLLECTION_NAME,
+  DB_OPERATION_NAME,
+  DB_SYSTEM_NAME,
+  SENTRY_OP,
+  SENTRY_ORIGIN,
+} from '@sentry/conventions/attributes';
+import { CACHE_GET, CACHE_PUT, CACHE_REMOVE } from '@sentry/conventions/op';
+import { CACHE_OPERATION_NAMES, getClient, hasSpanStreamingEnabled, isObjectLike, startSpan } from '@sentry/core';
+
+const ORIGIN = 'auto.cache.cloudflare.kv';
+
+type KVOperation = 'get' | 'getWithMetadata' | 'put' | 'delete' | 'list';
+
+const OPERATION_SPAN_OPS = {
+  get: CACHE_GET,
+  getWithMetadata: CACHE_GET,
+  put: CACHE_PUT,
+  delete: CACHE_REMOVE,
+  list: CACHE_GET,
+} as const satisfies Record<KVOperation, string>;
+
+function getCacheKeys(operation: KVOperation, args: unknown[]): string[] | undefined {
+  if (operation === 'list') {
+    return undefined;
+  }
+
+  const key = args[0];
+
+  if (Array.isArray(key)) {
+    return key.map(value => String(value));
+  }
+
+  return typeof key === 'string' ? [key] : key == null ? undefined : [String(key)];
+}
+
+function createSpanOptions(bindingName: string, operation: KVOperation, args: unknown[]) {
+  const cacheOperation = OPERATION_SPAN_OPS[operation];
+  const cacheOperationName = CACHE_OPERATION_NAMES[cacheOperation];
+  const keys = getCacheKeys(operation, args);
+  const client = getClient();
+
+  return {
+    name: client && hasSpanStreamingEnabled(client) ? cacheOperation : keys?.join(', ') || operation,
+    attributes: {
+      [SENTRY_OP]: cacheOperation,
+      [CACHE_OPERATION]: cacheOperationName,
+      [SENTRY_ORIGIN]: ORIGIN,
+      ...(keys && keys.length > 0 && { [CACHE_KEY]: keys.length > 1 ? keys : keys[0] }),
+      [DB_OPERATION_NAME]: operation,
+      [DB_COLLECTION_NAME]: bindingName,
+      [DB_SYSTEM_NAME]: 'cloudflare-kv',
+    },
+  };
+}
+
+function resolveCacheHit(operation: KVOperation, result: unknown): boolean {
+  if (operation === 'list') {
+    return false;
+  }
+
+  if (result instanceof Map) {
+    return Array.from(result.values()).some(value => resolveCacheHit(operation, value));
+  }
+
+  if (operation === 'getWithMetadata' && isObjectLike(result) && 'value' in result) {
+    return result.value != null;
+  }
+
+  return result != null;
+}
+
+/**
+ * Wraps a Cloudflare Workers KV binding to create cache spans on namespace operations.
+ *
+ * Instrumented methods: get, getWithMetadata, put, delete, and list.
+ */
+export function instrumentKV<T extends KVNamespace>(kv: T, bindingName: string): T {
+  return new Proxy(kv, {
+    get(target, prop, receiver) {
+      if (prop === 'get' || prop === 'getWithMetadata' || prop === 'put' || prop === 'delete' || prop === 'list') {
+        const original = Reflect.get(target, prop, receiver);
+
+        if (typeof original !== 'function') {
+          return original;
+        }
+
+        return function (this: unknown, ...args: unknown[]) {
+          const operation = prop as KVOperation;
+
+          return startSpan(createSpanOptions(bindingName, operation, args), async span => {
+            const result = await Reflect.apply(original, target, args);
+
+            if (operation === 'get' || operation === 'getWithMetadata') {
+              span.setAttribute(CACHE_HIT, resolveCacheHit(operation, result));
+            }
+
+            return result;
+          });
+        };
+      }
+
+      return Reflect.get(target, prop, receiver);
+    },
+  });
+}