hanahmily opened a new issue #5340:
URL: https://github.com/apache/skywalking/issues/5340
We need to handle histogram with multiple labels just like below:
```
# HELP rpc_duration_seconds A summary of the RPC duration in seconds.
# TYPE rpc_duration_seconds summary
rpc_duration_seconds{quantile="0.01" status="200"} 3102
rpc_duration_seconds{quantile="0.05" status="200"} 3272
rpc_duration_seconds{quantile="0.5" status="200"} 4773
rpc_duration_seconds{quantile="0.9" status="200"} 9001
rpc_duration_seconds{quantile="0.99" status="200"} 76656
rpc_duration_seconds_sum 1.7560473e+07
rpc_duration_seconds_count 2693
rpc_duration_seconds{quantile="0.01" status="400"} 0
rpc_duration_seconds{quantile="0.05" status="400"} 12
rpc_duration_seconds{quantile="0.5" status="400"} 12
rpc_duration_seconds{quantile="0.9" status="400"} 14
rpc_duration_seconds{quantile="0.99" status="400"} 14
rpc_duration_seconds_sum 15
rpc_duration_seconds_count 220
```
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