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Custom classifier GROK pattern
%{ DATA:http } \ s+%{TIMESTAMP_ISO8601:timestamp_response} \ s+%{ DATA:gatewa
y } \ s+%{ DATA:client } \ s+%{ DATA:target } \ s+%{BASE10NUM:request_processing_tim
e} \ s+%{BASE10NUM:target_processing_time} \ s+%{BASE10NUM:response_proce
ssing_time} \ s+%{BASE10NUM:elb_status_code} \ s+%{BASE10NUM:target_status
_code} \ s+%{BASE10NUM:received_bytes} \ s+%{BASE10NUM:sent_bytes} \ s+ \ "%{
DATA:target_request } \ " \ s+ \ "%{ DATA:user_agent } \ " \ s+%{ DATA:ssl_cipher } \ s+%{ DA
TA:ssl_protocol } \ s+%{ DATA:target_group_arn } \ s+ \ "%{ DATA:trace_id } \ " \ s+ \ "%{ DAT
A:domain_name } \ " \ s+ \ "%{ DATA:chosen_cert_arn } \ " \ s+%{ DATA:matched_rule_pri
ority } \ s+%{TIMESTAMP_ISO8601:timestamp_request} \ s+ \ "%{ DATA:actions_execu
ted } \ " \ s+ \ "%{ DATA:redirect_url } \ " \ s+ \ "%{ DATA:error_reason } \ "
