diff --git a/AGENTS.md b/AGENTS.md
index fdf86406a0..04bd6cb440 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -106,6 +106,7 @@ For deeper context, see:
 
 - `addTelemetryUsage` tracks **which public API the customer calls and which options they pass** (static call-site information)
 - Do NOT include runtime state analysis (e.g., whether a view was active, whether a value was overwritten) in telemetry usage — that belongs elsewhere
+- In serialized telemetry configuration, the `use_` prefix is reserved for boolean fields that track the usage of a configuration option that might contain customer data (e.g. `use_allowed_tracing_urls`)
 
 ### Auto-Generated Files
 
diff --git a/packages/core/src/domain/telemetry/telemetryEvent.types.ts b/packages/core/src/domain/telemetry/telemetryEvent.types.ts
index 81033d1c71..b3dd7be5c6 100644
--- a/packages/core/src/domain/telemetry/telemetryEvent.types.ts
+++ b/packages/core/src/domain/telemetry/telemetryEvent.types.ts
@@ -470,6 +470,10 @@ export type TelemetryConfigurationEvent = CommonTelemetryProperties & {
        * Whether trace baggage is propagated to child spans
        */
       propagate_trace_baggage?: boolean
+      /**
+       * How the SDK tracks resource request/response headers
+       */
+      track_resource_headers?: 'default_headers' | 'custom'
       /**
        * Whether the beta encode cookie options is enabled
        */
@@ -981,6 +985,6 @@ export interface AndroidNetworkInstrumentation {
   /**
    * The network instrumentation API used
    */
-  type: 'CRONET' | 'OKHTTP'
+  type: 'CRONET' | 'OKHTTP' | 'LEGACY_OKHTTP'
   [k: string]: unknown
 }
diff --git a/packages/rum-core/src/domain/configuration/configuration.spec.ts b/packages/rum-core/src/domain/configuration/configuration.spec.ts
index 5caeef9f9f..95a513395f 100644
--- a/packages/rum-core/src/domain/configuration/configuration.spec.ts
+++ b/packages/rum-core/src/domain/configuration/configuration.spec.ts
@@ -635,6 +635,42 @@ describe('validateAndBuildRumConfiguration', () => {
         expect(serializeRumConfiguration(wrongTracingConfig).selected_tracing_propagators).toEqual([])
       })
     })
+
+    describe('track_resource_headers telemetry', () => {
+      it('should omit track_resource_headers when trackResourceHeaders is undefined or false', () => {
+        expect(serializeRumConfiguration(DEFAULT_INIT_CONFIGURATION).track_resource_headers).toBeUndefined()
+        expect(
+          serializeRumConfiguration({ ...DEFAULT_INIT_CONFIGURATION, trackResourceHeaders: false })
+            .track_resource_headers
+        ).toBeUndefined()
+      })
+
+      it('should set track_resource_headers to default_headers when trackResourceHeaders is true', () => {
+        expect(
+          serializeRumConfiguration({ ...DEFAULT_INIT_CONFIGURATION, trackResourceHeaders: true })
+            .track_resource_headers
+        ).toBe('default_headers')
+      })
+
+      it('should set track_resource_headers to custom when trackResourceHeaders is an array', () => {
+        expect(
+          serializeRumConfiguration({ ...DEFAULT_INIT_CONFIGURATION, trackResourceHeaders: [] }).track_resource_headers
+        ).toBe('custom')
+        expect(
+          serializeRumConfiguration({
+            ...DEFAULT_INIT_CONFIGURATION,
+            trackResourceHeaders: [{ name: 'x-foo' }],
+          }).track_resource_headers
+        ).toBe('custom')
+      })
+
+      it('should omit track_resource_headers when trackResourceHeaders has an unexpected type', () => {
+        expect(
+          serializeRumConfiguration({ ...DEFAULT_INIT_CONFIGURATION, trackResourceHeaders: 42 as any })
+            .track_resource_headers
+        ).toBeUndefined()
+      })
+    })
   })
 
   describe('workerUrl', () => {
@@ -813,8 +849,8 @@ describe('serializeRumConfiguration', () => {
         : Key extends 'trackLongTasks'
           ? 'track_long_task' // We forgot the s, keeping this for backward compatibility
           : // The following options are not reported as telemetry. Please avoid adding more of them.
-            // TODO: Add betaTrackActionsInShadowDom and trackResourceHeaders to rum-events-format telemetry schema and remove from this exclusion
-            Key extends 'applicationId' | 'subdomain' | 'betaTrackActionsInShadowDom' | 'trackResourceHeaders'
+            // TODO: Add betaTrackActionsInShadowDom to rum-events-format telemetry schema and remove from this exclusion
+            Key extends 'applicationId' | 'subdomain' | 'betaTrackActionsInShadowDom'
             ? never
             : CamelToSnakeCase<Key>
     // By specifying the type here, we can ensure that serializeConfiguration is returning an
@@ -855,6 +891,7 @@ describe('serializeRumConfiguration', () => {
       remote_configuration_id: '123',
       use_remote_configuration_proxy: true,
       profiling_sample_rate: 42,
+      track_resource_headers: 'default_headers',
     })
   })
 })
diff --git a/packages/rum-core/src/domain/configuration/configuration.ts b/packages/rum-core/src/domain/configuration/configuration.ts
index f8277fa005..89b7a02365 100644
--- a/packages/rum-core/src/domain/configuration/configuration.ts
+++ b/packages/rum-core/src/domain/configuration/configuration.ts
@@ -628,9 +628,21 @@ function hasGraphQlResponseErrorsTracking(allowedGraphQlUrls: RumInitConfigurati
   )
 }
 
+function getTrackResourceHeadersTelemetryValue(
+  trackResourceHeaders: RumInitConfiguration['trackResourceHeaders']
+): 'default_headers' | 'custom' | undefined {
+  if (trackResourceHeaders === true) {
+    return 'default_headers'
+  }
+  if (Array.isArray(trackResourceHeaders)) {
+    return 'custom'
+  }
+}
+
 export function serializeRumConfiguration(configuration: RumInitConfiguration) {
   const baseSerializedConfiguration = serializeConfiguration(configuration)
 
+  // `use_` prefix is for telemetry options that track usage of a configuration option as a boolean to avoid capturing customer data
   return {
     session_replay_sample_rate: configuration.sessionReplaySampleRate,
     start_session_replay_recording_manually: configuration.startSessionReplayRecordingManually,
@@ -662,6 +674,7 @@ export function serializeRumConfiguration(configuration: RumInitConfiguration) {
     remote_configuration_id: configuration.remoteConfigurationId,
     profiling_sample_rate: configuration.profilingSampleRate,
     use_remote_configuration_proxy: !!configuration.remoteConfigurationProxy,
+    track_resource_headers: getTrackResourceHeadersTelemetryValue(configuration.trackResourceHeaders),
     ...baseSerializedConfiguration,
   } satisfies RawTelemetryConfiguration
 }
diff --git a/packages/rum-core/src/rumEvent.types.ts b/packages/rum-core/src/rumEvent.types.ts
index 04e06ab94b..2cccc7f9ba 100644
--- a/packages/rum-core/src/rumEvent.types.ts
+++ b/packages/rum-core/src/rumEvent.types.ts
@@ -862,7 +862,7 @@ export type RumResourceEvent = CommonProperties &
         /**
          * HTTP headers of the resource request
          */
-        readonly headers?: {
+        headers?: {
           [k: string]: string
         }
         [k: string]: unknown
@@ -874,7 +874,7 @@ export type RumResourceEvent = CommonProperties &
         /**
          * HTTP headers of the resource response
          */
-        readonly headers?: {
+        headers?: {
           [k: string]: string
         }
         [k: string]: unknown
@@ -1732,6 +1732,8 @@ export interface ViewProperties {
       | 'fragment_redisplay'
       | 'view_controller_display'
       | 'view_controller_redisplay'
+      | 'session_renewal'
+      | 'bf_cache'
     /**
      * Time spent on the view in ns
      */
diff --git a/rum-events-format b/rum-events-format
index 5a80fb9a3c..4f4ab2c504 160000
--- a/rum-events-format
+++ b/rum-events-format
@@ -1 +1 @@
-Subproject commit 5a80fb9a3c054b28fba195fd301cadb094bccef8
+Subproject commit 4f4ab2c50456d688ae228904ced4c68aa382ae4c