test: give the twenty-one bare #[ignore] attributes their reasons (#6049)

rustfs/tests/concurrent_download_tool.rs

@@ -369,7 +369,7 @@ async fn run_concurrent_downloads(settings: DownloadSettings) -> Result<Download
 }
 
 #[tokio::test]
-#[ignore]
+#[ignore = "manual performance tool: requires a running RustFS server configured via env vars"]
 async fn concurrent_download_tool() -> Result<()> {
     let settings = DownloadSettings::from_env()?;
     let summary = run_concurrent_downloads(settings).await?;

rustfs/tests/gt1g_get_benchmark_tool.rs

@@ -512,7 +512,7 @@ async fn run_bench(settings: &ToolSettings, client: &Client) -> Result<()> {
 }
 
 #[tokio::test]
-#[ignore]
+#[ignore = "manual >1GiB GET benchmark: requires a running RustFS server configured via env vars"]
 async fn gt1g_get_benchmark_tool() -> Result<()> {
     let settings = ToolSettings::from_env()?;
     let client = build_client(&settings).await?;

rustfs/tests/lifecycle_minio_sdk_test.rs

@@ -179,7 +179,7 @@ impl Oss {
 
 #[tokio::test]
 #[serial]
-#[ignore]
+#[ignore = "requires a running RustFS server at TEST_RUSTFS_SERVER (default http://localhost:9000)"]
 async fn test_lifecycle_minio_sdk() -> Result<()> {
     let settings = Settings::new();
     let oss = Oss::new(&settings).await?;