set flask app instances to log json in k8s clusters

sample-server/uwsgi.ini

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+[uwsgi]
+; general uWSGI config for sample
+callable = app
+module = app
+plugin = python3
+plugin = stdio
+socket = localhost:8080
+
+; logger config
+
+; application logs: log without modifying
+logger = secondlogger stdio
+log-route = secondlogger atst
+log-encoder = format:secondlogger ${msg}
+
+; default uWSGI messages (start, stop, etc.)
+logger = default stdio
+log-route = default ^((?!atst).)*$
+log-encoder = json:default {"timestamp":"${strftime:%%FT%%T}","source":"uwsgi","severity":"DEBUG","message":"${msg}"}
+log-encoder = nl
+
+; uWSGI request logs
+logger-req = stdio
+log-format = request_id=%(var.HTTP_X_REQUEST_ID), pid=%(pid), remote_add=%(addr), request=%(method) %(uri), status=%(status), body_bytes_sent=%(rsize), referer=%(referer), user_agent=%(uagent), http_x_forwarded_for=%(var.HTTP_X_FORWARDED_FOR)
+log-req-encoder = json {"timestamp":"${strftime:%%FT%%T}","source":"req","severity":"INFO","message":"${msg}"}
+log-req-encoder = nl