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diff --git a/third_party/rust/glean-core/src/traits/quantity.rs b/third_party/rust/glean-core/src/traits/quantity.rs
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+++ b/third_party/rust/glean-core/src/traits/quantity.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/.
+
+use crate::ErrorType;
+
+/// A description for the [`QuantityMetric`](crate::metrics::QuantityMetric) type.
+///
+/// When changing this trait, make sure all the operations are
+/// implemented in the related type in `../metrics/`.
+pub trait Quantity {
+    /// Sets the value. Must be non-negative.
+    ///
+    /// # Arguments
+    ///
+    /// * `value` - The value. Must be non-negative.
+    ///
+    /// ## Notes
+    ///
+    /// Logs an error if the `value` is negative.
+    fn set(&self, value: i64);
+
+    /// **Exported for test purposes.**
+    ///
+    /// Gets the currently stored value as an integer.
+    ///
+    /// This doesn't clear the stored value.
+    ///
+    /// # Arguments
+    ///
+    /// * `ping_name` - represents the optional name of the ping to retrieve the
+    ///   metric for. Defaults to the first value in `send_in_pings`.
+    fn test_get_value<'a, S: Into<Option<&'a str>>>(&self, ping_name: S) -> Option<i64>;
+
+    /// **Exported for test purposes.**
+    ///
+    /// Gets the number of recorded errors for the given metric and error type.
+    ///
+    /// # Arguments
+    ///
+    /// * `error` - The type of error
+    ///
+    /// # Returns
+    ///
+    /// The number of errors reported.
+    fn test_get_num_recorded_errors(&self, error: ErrorType) -> i32;
+}