class_docstr: SEVIRI Level 1.5 trailer for native-format.
  
  Reference Document (EUM/MSG/ICD/105):
  MSG Level 1.5 Image Data Format Description
docstr: Get time and completeness record data.
code: def timeliness_and_completeness(self):
      """Get time and completeness record data."""
      timeliness = [
          ("MaxDelay", np.float32),
          ("MinDelay", np.float32),
          ("MeanDelay", np.float32),
      ]
  
      completeness = [
          ("PlannedL15ImageLines", np.uint16),
          ("GeneratedL15ImageLines", np.uint16),
          ("ValidL15ImageLines", np.uint16),
          ("DummyL15ImageLines", np.uint16),
          ("CorruptedL15ImageLines", np.uint16),
      ]
  
      record = [
          ("Timeliness", timeliness),
          ("Completeness", (completeness, 12)),
      ]
  
      return record
  
imports: import numpy
  from satpy.readers.eum_base import time_cds, time_cds_expanded, time_cds_short
  from satpy.readers.seviri_base import HRV_NUM_COLUMNS, HRV_NUM_LINES, VISIR_NUM_COLUMNS, VISIR_NUM_LINES
label_desc: Use image node_id 7 for calling the Msg15NativeTrailerRecord obj's underlying member method code with example usage: obj.timeliness_and_completeness() and returns: record