scalability framework: Jupyter fixes (#22537)

misc/python/materialize/git.py

@@ -188,7 +188,7 @@ def get_common_ancestor_commit(remote: str, branch: str, fetch_branch: bool) ->
 def get_commit_message(commit_sha: str) -> str | None:
     try:
         command = ["git", "log", "-1", "--pretty=format:%s", commit_sha]
-        return spawn.capture(command).strip()
+        return spawn.capture(command, stderr=subprocess.DEVNULL).strip()
     except subprocess.CalledProcessError:
         # Sometimes mz_version() will report a Git SHA that is not available
         # in the current repository

misc/python/materialize/scalability/endpoints.py

@@ -164,5 +164,5 @@ def endpoint_name_to_description(endpoint_name: str) -> str:
     commit_sha = endpoint_name.split(" ")[1].strip("()")
 
     # empty when mz_version() reports a Git SHA that is not available in the current repository
-    commit_message = git.get_commit_message(commit_sha)
+    commit_message = git.get_commit_message(commit_sha) or "unknown"
     return f"{endpoint_name} - {commit_message}"

test/scalability/lib.py

@@ -19,7 +19,7 @@
 
 
 def plotit(csv_file_name: str) -> None:
-    endpoints = next(os.walk(RESULTS_DIR))[1]
+    endpoints = get_endpoints_from_results_dir()
     legend = []
     plt.rcParams["figure.figsize"] = (16, 10)
     fig, (summary_subplot, details_subplot) = plt.subplots(2, 1)
@@ -43,3 +43,9 @@ def plotit(csv_file_name: str) -> None:
     details_subplot.set_ylabel("Latency in Seconds")
     details_subplot.set_xlabel("Concurrent SQL Connections")
     details_subplot.legend(legend)
+
+
+def get_endpoints_from_results_dir() -> list[str]:
+    directories = next(os.walk(RESULTS_DIR))[1]
+    endpoints = [entry for entry in directories if not entry.startswith(".")]
+    return endpoints