[Metrics] Add --show-hidden-metrics-for-version CLI arg (#13295)

vllm/version.py

@@ -11,3 +11,21 @@ except Exception as e:
 
     __version__ = "dev"
     __version_tuple__ = (0, 0, __version__)
+
+
+def _prev_minor_version_was(version_str):
+    """Check whether a given version matches the previous minor version.
+
+    Return True if version_str matches the previous minor version.
+
+    For example - return True if the current version if 0.7.4 and the
+    supplied version_str is '0.6'.
+
+    Used for --show-hidden-metrics-for-version.
+    """
+    # Match anything if this is a dev tree
+    if __version_tuple__[0:2] == (0, 0):
+        return True
+
+    # Note - this won't do the right thing when we release 1.0!
+    return version_str == f"{__version_tuple__[0]}.{__version_tuple__[1] - 1}"