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diff --git a/toolkit/components/glean/api/src/private/mod.rs b/toolkit/components/glean/api/src/private/mod.rs
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+++ b/toolkit/components/glean/api/src/private/mod.rs
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+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+//! The different metric types supported by the Glean SDK to handle data.
+
+use serde::{Deserialize, Serialize};
+
+// Re-export of `glean` types we can re-use.
+// That way a user only needs to depend on this crate, not on glean (and there can't be a
+// version mismatch).
+pub use glean::{
+    traits, CommonMetricData, DistributionData, ErrorType, Lifetime, MemoryUnit, RecordedEvent,
+    TimeUnit, TimerId,
+};
+
+mod boolean;
+mod counter;
+mod custom_distribution;
+mod datetime;
+mod denominator;
+mod event;
+mod labeled;
+mod labeled_counter;
+mod memory_distribution;
+mod numerator;
+mod ping;
+mod quantity;
+mod rate;
+pub(crate) mod string;
+mod string_list;
+mod text;
+mod timespan;
+mod timing_distribution;
+mod url;
+mod uuid;
+
+pub use self::boolean::BooleanMetric;
+pub use self::boolean::BooleanMetric as LabeledBooleanMetric;
+pub use self::counter::CounterMetric;
+pub use self::custom_distribution::CustomDistributionMetric;
+pub use self::datetime::DatetimeMetric;
+pub use self::denominator::DenominatorMetric;
+pub use self::event::{EventMetric, EventRecordingError, ExtraKeys, NoExtraKeys};
+pub use self::labeled::LabeledMetric;
+pub use self::labeled_counter::LabeledCounterMetric;
+pub use self::memory_distribution::MemoryDistributionMetric;
+pub use self::numerator::NumeratorMetric;
+pub use self::ping::Ping;
+pub use self::quantity::QuantityMetric;
+pub use self::rate::RateMetric;
+pub use self::string::StringMetric;
+pub use self::string::StringMetric as LabeledStringMetric;
+pub use self::string_list::StringListMetric;
+pub use self::text::TextMetric;
+pub use self::timespan::TimespanMetric;
+pub use self::timing_distribution::TimingDistributionMetric;
+pub use self::url::UrlMetric;
+pub use self::uuid::UuidMetric;
+
+/// Uniquely identifies a single metric within its metric type.
+#[derive(Debug, PartialEq, Eq, Hash, Copy, Clone, Deserialize, Serialize)]
+#[repr(transparent)]
+pub struct MetricId(pub(crate) u32);
+
+impl MetricId {
+    pub fn new(id: u32) -> Self {
+        Self(id)
+    }
+}
+
+impl From<u32> for MetricId {
+    fn from(id: u32) -> Self {
+        Self(id)
+    }
+}