feat: report the machine's isolation level in the upload metadata

src/run_environment/provider.rs

@@ -145,6 +145,7 @@ pub trait RunEnvironmentProvider {
                 instruments: config.instruments.get_active_instrument_names(),
                 executor: executor_name,
                 exclude_allocations: config.exclude_allocations,
+                isolation: get_runner_isolation(),
                 system_info: system_info.clone(),
             },
             run_environment: self.get_run_environment(),
@@ -158,6 +159,13 @@ pub trait RunEnvironmentProvider {
     }
 }
 
+fn get_runner_isolation() -> Option<String> {
+    std::env::var("CODSPEED_RUNNER_ISOLATION")
+        .ok()
+        .map(|value| value.trim().to_string())
+        .filter(|value| !value.is_empty())
+}
+
 fn get_commit_hash_default_impl(repository_root_path: &str) -> Result<String> {
     let repo = Repository::open(repository_root_path).context(format!(
         "Failed to open repository at path: {repository_root_path}"
@@ -182,4 +190,17 @@ mod tests {
         // ensure that the commit hash is correct, thus it has 40 characters
         assert_eq!(commit_hash.len(), 40);
     }
+
+    #[test]
+    fn test_get_runner_isolation() {
+        temp_env::with_var("CODSPEED_RUNNER_ISOLATION", Some(" strict "), || {
+            assert_eq!(get_runner_isolation(), Some("strict".into()));
+        });
+        temp_env::with_var("CODSPEED_RUNNER_ISOLATION", Some("  "), || {
+            assert_eq!(get_runner_isolation(), None);
+        });
+        temp_env::with_var_unset("CODSPEED_RUNNER_ISOLATION", || {
+            assert_eq!(get_runner_isolation(), None);
+        });
+    }
 }

src/upload/interfaces.rs

@@ -55,6 +55,10 @@ pub struct Runner {
     /// byte-identical to legacy runs that predate this field.
     #[serde(skip_serializing_if = "std::ops::Not::not")]
     pub exclude_allocations: bool,
+    /// Isolation level of the machine running the benchmarks, as reported by
+    /// the environment through `CODSPEED_RUNNER_ISOLATION`.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub isolation: Option<String>,
     #[serde(flatten)]
     pub system_info: SystemInfo,
 }

src/upload/upload_metadata.rs

@@ -49,6 +49,7 @@ mod tests {
                 instruments: vec![InstrumentName::MongoDB],
                 executor: ExecutorName::Valgrind,
                 exclude_allocations: false,
+                isolation: None,
                 system_info: SystemInfo::test(),
             },
             run_environment: RunEnvironment::GithubActions,
@@ -108,6 +109,7 @@ mod tests {
                 instruments: vec![],
                 executor: ExecutorName::Valgrind,
                 exclude_allocations: false,
+                isolation: None,
                 system_info: SystemInfo {
                     os: crate::system::SupportedOs::Linux(
                         crate::system::LinuxDistribution::Other {