Add Spark tuning varprops to pageview_hourly DAG.
Just like with !469 (merged), we find ourselves again in a position in which we need to tune Spark settings.
This fix unbreaks the pageview_hourly
DAG.
More info on opsweek email: https://lists.wikimedia.org/hyperkitty/list/data-engineering-alerts@lists.wikimedia.org/thread/AX27YJC4N4B7A5GFD6DUVR5R7IAEDVVN/
Side note: I intend to follow up with a phab task to identify all DAGs were we are missing these Spark tunings to improve opsweek.