[GitHub] [airflow] andrewhharmon opened a new pull request #5414: [AIRFLOW-4790] Change dag processing stats to timers

[GitBox <gi...@apache.org>]

andrewhharmon opened a new pull request #5414: [AIRFLOW-4790] Change dag processing stats to timers
URL: https://github.com/apache/airflow/pull/5414
 
 
   Make sure you have checked _all_ steps below.
   
   ### Jira
   
   - [x] My PR addresses the following issues and references them in the PR title. 
     - https://issues.apache.org/jira/browse/AIRFLOW-4790
   
   ### Description
   
   - [x] the stasd metrics for dag processing should be changed from gauges to timers
   
   ### Tests
   
   - [x] scheduler job already has unit test
   
   ### Commits
   
   - [x] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)":
     1. Subject is separated from body by a blank line
     1. Subject is limited to 50 characters (not including Jira issue reference)
     1. Subject does not end with a period
     1. Subject uses the imperative mood ("add", not "adding")
     1. Body wraps at 72 characters
     1. Body explains "what" and "why", not "how"
   
   ### Documentation
   
   - [x] In case of new functionality, my PR adds documentation that describes how to use it.
     - updated metrics docs
   
   ### Code Quality
   
   - [x] Passes `flake8`
   

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