istio数据采集
Request Count (istio_requests_total):处理的总请求数,COUNTER类型;
rate(istio_requests_total[30s]):每30s的请求数
Request Duration (istio_request_duration_milliseconds):请求的持续时长,HISTOGRAM类型;
increase(istio_request_duration_milliseconds_sum[5m]) / increase(istio_request_duration_milliseconds_count[5m]) :每5分钟内请求的平均响应时间
Request Size (istio_request_bytes):请求体大小,HISTOGRAM类型;
Response Size (istio_response_bytes):响应体大小,HISTOGRAM类型;
gRPC Request Message Count (istio_request_messages_total):gRPC连接,请求消息总数;
gRPC Response Message Count (istio_response_messages_total):gRPC连接,响应消息总数;

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