Add telemetry::event! (#22146)

CC @JosephTLyons

Release Notes:

- N/A

crates/telemetry_events/Cargo.toml

@@ -14,3 +14,4 @@ path = "src/telemetry_events.rs"
 [dependencies]
 semantic_version.workspace = true
 serde.workspace = true
+serde_json.workspace = true

crates/telemetry_events/src/telemetry_events.rs

@@ -2,7 +2,7 @@
 
 use semantic_version::SemanticVersion;
 use serde::{Deserialize, Serialize};
-use std::{fmt::Display, sync::Arc, time::Duration};
+use std::{collections::HashMap, fmt::Display, sync::Arc, time::Duration};
 
 #[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct EventRequestBody {
@@ -91,6 +91,7 @@ impl Display for AssistantPhase {
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 #[serde(tag = "type")]
 pub enum Event {
+    Flexible(FlexibleEvent),
     Editor(EditorEvent),
     InlineCompletion(InlineCompletionEvent),
     InlineCompletionRating(InlineCompletionRatingEvent),
@@ -106,6 +107,12 @@ pub enum Event {
     Repl(ReplEvent),
 }
 
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub struct FlexibleEvent {
+    pub event_type: String,
+    pub event_properties: HashMap<String, serde_json::Value>,
+}
+
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 pub struct EditorEvent {
     /// The editor operation performed (open, save)