[AIRFLOW-5645] Precise webserver status monitoring possibilities in quickstart

[tpilewicz]

Make sure you have checked all steps below.

Jira

• My PR addresses the following Airflow Jira issues and references them in the PR title. For example, "[AIRFLOW-XXX] My Airflow PR"
  • https://issues.apache.org/jira/browse/AIRFLOW-5645
  • 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).
  • In case you are adding a dependency, check if the license complies with the ASF 3rd Party License Policy.

Description

• Here are some details about my PR, including screenshots of any UI changes:

My PR adds details in the quickstart of Airflow, precising that the web UI can be used to monitor the evolution of state of Task Instances and DAG runs. I suggest adding this because it is a central feature of Airflow.

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

Only adding precisions in the documentation.

Commits

• 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":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters (not including Jira issue reference)
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

Documentation

• 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 so we can assign it to a appropriate release

[codecov-io]

Codecov Report

Merging #6316 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6316      +/-   ##
==========================================
+ Coverage   80.34%   80.35%   +<.01%     
==========================================
  Files         616      616              
  Lines       35733    35733              
==========================================
+ Hits        28711    28713       +2     
+ Misses       7022     7020       -2

Impacted Files	Coverage Δ
airflow/utils/dag_processing.py	56.72% <0%> (-0.18%)	⬇️
airflow/models/taskinstance.py	93.77% <0%> (+0.5%)	⬆️

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[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.