uwsgi: bump workers + add max-requests/harakiri (#204)

processes 2->4, threads 4->8 (8 -> 32 concurrent slots) so a few slow
requests don't saturate the worker pool.

Author: cooper667

deploy/uwsgi.ini

@@ -3,7 +3,16 @@ http = 127.0.0.1:8000
 virtualenv = /usr/lib/adx/venv
 wsgi-file = /usr/lib/adx/submodules/ckan/wsgi.py
 callable = application
-processes = 2
-threads = 4
+processes = 4
+threads = 8
 enable-threads = true
 master = true
+# Recycle workers after N requests to bound SQLAlchemy session-cache
+# and Python heap growth; without this, per-request latency climbs
+# within a single worker's lifetime under sustained load.
+max-requests = 500
+# Time-bound a request so a hung handler can't pin one of the 32 slots
+# indefinitely (e.g. a slow downstream call). harakiri-verbose logs
+# a Python traceback for whichever frame was running when killed.
+harakiri = 60
+harakiri-verbose = true