Bug 1995607 - Remove participation from Cirrus EnrollmentRequest

CHANGELOG.md

@@ -13,6 +13,12 @@
 ### Glean
 - Updated to v66.0.0 ([#7025](https://github.com/mozilla/application-services/issues/7025))
 
+### Nimbus
+- The `participation` field is no longer required in the Cirrus
+  `EnrollmentRequest` type. Instead, when users opt-out, the client application
+  should no longer send enrollment requests to Cirrus.
+  ([#7030](https://github.com/mozilla/application-services/pull/7030))
+
 [Full Changelog](In progress)
 
 # v145.0 (_2025-10-13_)

components/nimbus/src/stateless/cirrus_client.rs

@@ -5,7 +5,7 @@
 use crate::{
     enrollment::{
         map_features_by_feature_id, EnrolledFeatureConfig, EnrollmentChangeEvent,
-        EnrollmentsEvolver, ExperimentEnrollment, Participation,
+        EnrollmentsEvolver, ExperimentEnrollment,
     },
     error::CirrusClientError,
     metrics::{EnrollmentStatusExtraDef, MetricsHandler},
@@ -43,15 +43,13 @@ impl fmt::Display for EnrollmentResponse {
 /// Definitions for the fields are as follows:
 /// - `client_id`: This field is the client's id as defined by the calling application. Though this is an Option type, if it is missing the method will throw a NimbusError.
 /// - `context`: The application context for the request. This value will be converted into TargetingAttributes.
-/// - `is_user_participating`: Whether or not the user is participating in experimentation. Defaults to `true`
 /// - `next_experiments`: The list of experiments for which enrollment should be evaluated.
 /// - `prev_enrollments`: The client's current list of enrollments.
 #[derive(Serialize, Deserialize, Debug, Clone, Default)]
 #[serde(rename_all = "camelCase")]
 pub struct EnrollmentRequest {
     pub client_id: Option<String>,
     pub request_context: Map<String, Value>,
-    pub participation: Participation,
     #[serde(default)]
     pub prev_enrollments: Vec<ExperimentEnrollment>,
 }
@@ -97,7 +95,6 @@ impl CirrusClient {
         let EnrollmentRequest {
             client_id,
             request_context,
-            participation,
             prev_enrollments,
         } = match serde_json::from_str(request.as_str()) {
             Ok(v) => v,
@@ -114,7 +111,6 @@ impl CirrusClient {
         Ok(match serde_json::to_string(&self.enroll(
             client_id,
             request_context,
-            participation,
             &prev_enrollments,
         )?) {
             Ok(v) => v,
@@ -126,7 +122,6 @@ impl CirrusClient {
         &self,
         user_id: String,
         request_context: Map<String, Value>,
-        participation: Participation,
         prev_enrollments: &[ExperimentEnrollment],
     ) -> Result<EnrollmentResponse> {
         let available_randomization_units =
@@ -148,7 +143,7 @@ impl CirrusClient {
 
         let (enrollments, events) = enrollments_evolver
             .evolve_enrollments::<EnrolledFeatureConfig>(
-                participation,
+                Default::default(),
                 Default::default(),
                 &state.experiments,
                 prev_enrollments,

components/nimbus/src/tests/stateless/test_cirrus_client.rs

@@ -5,7 +5,7 @@
 use crate::metrics::EnrollmentStatusExtraDef;
 use crate::{
     enrollment::{
-        EnrollmentChangeEventType, ExperimentEnrollment, NotEnrolledReason, Participation,
+        EnrollmentChangeEventType, ExperimentEnrollment, NotEnrolledReason,
     },
     tests::{
         helpers::TestMetrics,
@@ -50,7 +50,6 @@ fn test_can_enroll() -> Result<()> {
     let result = client.enroll(
         "test".to_string(),
         Default::default(),
-        Participation::default(),
         &[],
     )?;
     assert_eq!(result.enrolled_feature_config_map.len(), 1);
@@ -90,7 +89,6 @@ fn test_will_not_enroll_if_previously_did_not_enroll() -> Result<()> {
     let result = client.enroll(
         "test".to_string(),
         Default::default(),
-        Participation::default(),
         &[enrollment],
     )?;
 
@@ -119,10 +117,6 @@ fn test_handle_enrollment_works_with_json() -> Result<()> {
             )]))
             .unwrap(),
         ),
-        (
-            "participation".to_string(),
-            to_value(Participation::default()).unwrap(),
-        ),
         (
             "nextExperiments".to_string(),
             Value::Array(vec![to_value(exp.clone()).unwrap()]),
@@ -214,7 +208,6 @@ fn test_sends_metrics_on_enrollment() -> Result<()> {
     client.enroll(
         "test".to_string(),
         Default::default(),
-        Participation::default(),
         &[],
     )?;