Transform Histogram Latency Bucket

[zip-chanko]

May I know how to use the transformprocessor to convert the histogram bucket to count or something else?

My use case is transforming kong_request_latency_ms to target monitoring platform which is not supported histogram.

# HELP kong_request_latency_ms Total latency incurred during requests for each service/route in Kong
# TYPE kong_request_latency_ms histogram
kong_request_latency_ms_bucket{service="google",route="google.route-1",le="25"} 1
kong_request_latency_ms_bucket{service="google",route="google.route-1",le="50"} 1
kong_request_latency_ms_bucket{service="google",route="google.route-1",le="80"} 1
kong_request_latency_ms_bucket{service="google",route="google.route-1",le="100"} 1
kong_request_latency_ms_bucket{service="google",route="google.route-1",le="250"} 1
kong_request_latency_ms_bucket{service="google",route="google.route-1",le="400"} 1
kong_request_latency_ms_bucket{service="google",route="google.route-1",le="700"} 1
kong_request_latency_ms_bucket{service="google",route="google.route-1",le="1000"} 1
kong_request_latency_ms_bucket{service="google",route="google.route-1",le="2000"} 1
kong_request_latency_ms_bucket{service="google",route="google.route-1",le="5000"} 1
kong_request_latency_ms_bucket{service="google",route="google.route-1",le="10000"} 1
kong_request_latency_ms_bucket{service="google",route="google.route-1",le="30000"} 1
kong_request_latency_ms_bucket{service="google",route="google.route-1",le="60000"} 1
kong_request_latency_ms_bucket{service="google",route="google.route-1",le="+Inf"} 1
kong_request_latency_ms_count{service="google",route="google.route-1"} 1
kong_request_latency_ms_sum{service="google",route="google.route-1"} 6

I can use extract_count_metric and extract_sum_metric but couldn't find a way to get the bucket.