robinedwards opened a new pull request #6684: [AIRFLOW-6095] Filter dags 
returned by task_stats
URL: https://github.com/apache/airflow/pull/6684
 
 
   
   ### Jira
   
   - [x] My PR addresses the following [Airflow 
Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references 
them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
     - https://issues.apache.org/jira/browse/AIRFLOW-XXX
     - In case you are fixing a typo in the documentation you can prepend your 
commit with \[AIRFLOW-XXX\], code changes always need a Jira issue.
     - In case you are proposing a fundamental code change, you need to create 
an Airflow Improvement Proposal 
([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals)).
     - In case you are adding a dependency, check if the license complies with 
the [ASF 3rd Party License 
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   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI 
changes:
   
   Add dag_ids parameter to task_stats end point so can filter by a set of 
dag_ids
   present on the page. This is intended to speed up the response time
   and reduce the size of the payload when running a large number of dags. I've 
experienced this endpoint taking up to 10 seconds and returning a 8mb 
(uncompressed) payload for around 1500 dags.
   
   ### Tests
   
   - [x] My PR adds the following unit tests:
   
   See test_views.py
   
   ### 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.
     - All the public functions and the classes in the PR contain docstrings 
that explain what it does
     - If you implement backwards incompatible changes, please leave a note in 
the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so 
we can assign it to a appropriate release
   
   - No documentation needed

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