docstr: Flat list of keys for a provided dimension and histogram type
docstr_tok: ["Flat","list","of","keys","for","a","provided","dimension","and","histogram","type"]
code: def get_keys_by_dim_and_htype(self, dim, htype) -> list[str]:
      """Flat list of keys for a provided dimension and histogram type"""
      return [
          v
          for values in self._properties_to_func[dim][htype]
          for v in values
      ]
  
file_path: popmon/popmon/base/registry.py
imports: from __future__ import annotations
  from collections import defaultdict
  from typing import Any, Callable
label_desc: Use image node_id 7 for calling the Registry obj's underlying member method code with example usage: obj.get_keys_by_dim_and_htype(dim, htype) and returns: unknown