Add announcement for metrics initiative

posts/inside-rust/2024-08-12-announcing-metrics-initiative.md

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+---
+layout: post
+title: "Announcing the Metrics Initiative"
+author: Jane Losare-Lusby and Esteban Kuber
+team: The Rust Compiler Team <https://www.rust-lang.org/governance/teams/compiler>
+---
+
+We ([Jane](https://github.com/yaahc/) and [Esteban](https://github.com/estebank)) are excited to announce the start of the Metrics initiative.
+
+We're envisioning three use cases for metrics within rustc.
+
+* Supporting feature development
+    * e.g., answering specific questions such as when the old and new trait solvers diverge or helping identify and resolve bugs before impacting users
+* Guiding improvements to User Experience,
+    * e.g., knowing which compiler errors are causing the most confusion or are hit the most frequently, focusing on improving those first, and verifying that the improvements help
+* Improving perf feedback loops and insight,
+    * e.g., helping identify pathological edge cases, similar to work @nnethercote has done manually in the past
+
+We're at the point of the initiative where we would like to inform the project members about it and start implementing the metrics infrastructure in collaboration with their real-world needs.
+
+For more information about the initiative, please check out the tracking issue and related links: https://github.com/rust-lang/rust/issues/128914.
+
+**Please reach out with any use cases you have in mind!**