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We have gradually organised and improved the handling of configuration and metadata into yaml files. Most recently metadata was divided into index metadata .yaml files, a separate one for index_function, and another for input variable specification.

We should consider to have one file collecting various overall configurations that now reside at various places in the code. Candidates might be:

• MISSVAL (now a global?)
• minimum allowed number, or proportion, of data points to calculate a percentile, which is relevant at least for index functions percentile and thresholded_percentile
• the np.inf and -np.inf used to indicate "condition not met" in index functions first/last_occurrence et al.
• "Instructions" for processing of global metadata (#36)? There are two main aspects to consider:
  • basic functionality should be working before climix v.1.0 is released (cf. attempt in !72 (closed))
  • progress on iris #3325 that now has been pushed to iris v.3.1
• what schema is used for output tracking_id (cf. #16)
• ...