kunalyogenshah opened a new pull request #5139: [AIRFLOW-4360] Add performance metrics for Webserver UI. URL: https://github.com/apache/airflow/pull/5139 ### Jira - [x] My PR addresses the following [AIRFLOW-4360](https://issues.apache.org/jira/browse/AIRFLOW-4360) issues and references them in the PR title. ### Description This PR extends Statsd usage for tracking webserver metrics as well. For starters, we track: 1) Log page hits, and log fetching latency + failures. 2) Tree view and graph view latency + load failures. ### Tests Once enabled, you can see the following new counters in Statsd : ``` { counters: { 'statsd.bad_lines_seen': 0, 'statsd.packets_received': 68, 'statsd.metrics_received': 68, 'airflow.scheduler_heartbeat': 2, 'airflow.webserver.tree_view.views': 0, 'airflow.webserver.tree_view.load_failures': 0, 'airflow.webserver.graph_view.views': 0, 'airflow.webserver.graph_view.load_failures': 0, 'airflow.webserver.log.views': 1, 'airflow.webserver.log.load_failures': 0, 'airflow.webserver.ajax_logs_fetch.load_failures': 0 }, timers: { 'airflow.webserver.tree_view.load_time': [], 'airflow.webserver.graph_view.load_time': [], 'airflow.webserver.ajax_logs_fetch.load_time': [ 17.852 ] }, gauges: { 'airflow.collect_dags': 0.046903, 'airflow.dagbag_size': 1, 'airflow.dagbag_import_errors': 0, 'statsd.timestamp_lag': 0, 'airflow.pool.starving_tasks.not_pooled': 0 }, timer_data: { 'airflow.webserver.tree_view.load_time': { count_ps: 0, count: 0 }, 'airflow.webserver.graph_view.load_time': { count_ps: 0, count: 0 }, 'airflow.webserver.ajax_logs_fetch.load_time': { count_90: 1, mean_90: 17.852, upper_90: 17.852, sum_90: 17.852, sum_squares_90: 318.69390400000003, std: 0, upper: 17.852, lower: 17.852, count: 1, count_ps: 0.1, sum: 17.852, sum_squares: 318.69390400000003, mean: 17.852, median: 17.852 } }, counter_rates: { 'statsd.bad_lines_seen': 0, 'statsd.packets_received': 6.8, 'statsd.metrics_received': 6.8, 'airflow.scheduler_heartbeat': 0.2, 'airflow.webserver.tree_view.views': 0, 'airflow.webserver.tree_view.load_failures': 0, 'airflow.webserver.graph_view.views': 0, 'airflow.webserver.graph_view.load_failures': 0, 'airflow.webserver.log.views': 0.1, 'airflow.webserver.log.load_failures': 0, 'airflow.webserver.ajax_logs_fetch.load_failures': 0 }, sets: {}, pctThreshold: [ 90 ] } ``` ### 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](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 - [ ] 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 ### Code Quality - [ ] Passes `flake8`
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