code: def insert(self):
      import pymongo.errors
  
      if self.overwrite:
          return self.save()
  
      autoinc_key = self.run_entry.get("_id") is None
      while True:
          if autoinc_key:
              c = self.runs.find({}, {"_id": 1})
              c = c.sort("_id", pymongo.DESCENDING).limit(1)
              self.run_entry["_id"] = (
                  c.next()["_id"] + 1
                  if self.runs.count_documents({}, limit=1)
                  else 1
              )
          try:
              self.runs.insert_one(self.run_entry)
              return
          except pymongo.errors.InvalidDocument as e:
              raise ObserverError(
                  "Run contained an unserializable entry."
                  "(most likely in the info)\n{}".format(e)
              ) from e
          except pymongo.errors.DuplicateKeyError:
              if not autoinc_key:
                  raise
  
imports: from typing import Optional, Union
  import mimetypes
  import os.path
  import pickle
  import re
  import sys
  import time
  from tempfile import NamedTemporaryFile
  import warnings
  import sacred.optional
  from sacred.commandline_options import cli_option
  from sacred.dependencies import get_digest
  from sacred.observers.base import RunObserver
  from sacred.observers.queue import QueueObserver
  from sacred.serializer import flatten
  from sacred.utils import ObserverError, PathType
  import pkg_resources
label_desc: Use image node_id 15 for calling the MongoObserver obj's underlying member method code with example usage: obj.insert() and returns: self