commands: log repo requirements

Summary:
At the command start, log repo requirements.

We cannot do this in lib/repo since the sampling config wasn't loaded at that time.

Reviewed By: sggutier

Differential Revision: D66840177

fbshipit-source-id: 550bd8c71b3cf7c11e3fbfee7f398730382c6060

eden/scm/lib/commands/src/run.rs

@@ -214,6 +214,16 @@ fn dispatch_command(
     if let Some(repo) = dispatcher.repo() {
         tracing::info!(target: "symlink_info",
                        symlinks_enabled=cfg!(unix) || repo.requirements.contains("windowssymlinks"));
+        let _ = sampling::log!(
+            target: "repo_info",
+            repo_requirements = {
+                let reqs1 = repo.requirements.to_set();
+                let reqs2 = repo.store_requirements.to_set();
+                let mut reqs: Vec<String> = reqs1.into_iter().chain(reqs2.into_iter()).collect();
+                reqs.sort_unstable();
+                reqs
+            }
+        );
     }
 
     let run_logger =