Following are the observations
Seeing intermittent 503 in haproxy with termination code set to CD
Backend is chosen and set correctly by haproxy
http_total_time, tcp_total_time and server_response_time is high compared to requests served with 200 status code but still less than timeout configured in haproxy configuration file.
client_request_time is 0
Server chosen has active servers.
At the same time where 503 is seen 200 is also served for other requests.
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