Add labels on 1xx, 2xx, etc metrics

[realzero0]

Title: Add labels on 1xx, 2xx, etc metics

Description:

envoy provides upstreamrq<*xx> metrics, but in some cases, I wanna aggregate the data using request headers or response headers. If I know that some requests in latest app version fail, I can easily find out that something wrong in latest app version..

Could you add some labels on rq_*xx metrics? labels can be req, res headers..

Actually, in nginx, I can easily add that kind of aggregation using nginx vts module. https://github.com/vozlt/nginx-module-vts?tab=readme-ov-file#vhost_traffic_status_filter Please consider to add this kind of feature..

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[adisuissa]

Thanks for the suggestion! I wonder if this can be achieved with access-logs? I'm not sure if adding labels to stats makes sense, and what the implications will be. cc @jmarantz who may have some prior experience with this.

[realzero0]

@adisuissa Thank you for your reply! For your point of view, I wonder why you make upstreamrq<xx> kind of metrics in first place. In my point of view, upstreamrq<xx> data are aggregated data. this means I don't have to aggregate data from requests again.. If I want to get some alerts like if 10% of all requests(maybe all 5xx requests) that have 5xx status in specific request header(app version) occur, make an alert, if I only have access log, I have to make some other applications that can aggregate all requests and make metrics that have labels that are response status code(2xx, 3xx, 4xx, etc) and req, res headers...

[adisuissa]

I look at this from an Envoy perspective which isn't looking at specific headers, because there may be many and it will not scale well. I think you can achieve what you are looking for with a custom filter that defines the metrics, and tracks them on the response path.

[realzero0]

@adisuissa I want to know that many, not scale.. means. let me know that I did understand it correctly. many -> headers may be many not scale -> envoy is not prepared for metrics that have many headers..? I saw the metric logic and it might be not scale right?

envoy is proxy and this is for company level proxy in almost all times.. that means headers might differ per corp by corp.. and headers are restricted in corps. envoy might use control plane (like Istio) for configuration.. If I make a CRD (header metric configuration) for Istio, I can easily collect the metrics (including header information) from envoy proxy.. In this case, what many, not scale problems happen?

sorry I totally don't understand your explanation..

And for the custom filter, should I create a lua filter right..? Do you know any other filters that I can use?

[adisuissa]

Maybe it is I that don't understand your original request. Can you give a specific example of what you are trying to achieve?

[realzero0]

@adisuissa

let me explain it In prometheus metrics,

right now there are metrics like this.

envoy_cluster_upstream_rq_xx{envoy_response_code_class="2",envoy_cluster_name="a_inbound_cluster"} 10
envoy_cluster_upstream_rq_xx{envoy_response_code_class="3",envoy_cluster_name="a_inbound_cluster"} 20
envoy_cluster_upstream_rq_xx{envoy_response_code_class="5",envoy_cluster_name="a_inbound_cluster"} 30

but I wanna add some configurations and make some labels..

if I set headers like "app_version", "os_version"

envoy_cluster_upstream_rq_xx_filtered{envoy_response_code_class="2", app_version="1.0.0", os_version="Android10", ,envoy_cluster_name="a_inbound_cluster"} 5
envoy_cluster_upstream_rq_xx_filtered{envoy_response_code_class="3", app_version="1.0.0" , os_version="Android10", ,envoy_cluster_name="a_inbound_cluster"} 20
envoy_cluster_upstream_rq_xx_filtered{envoy_response_code_class="5", app_version="1.0.0" , os_version="Android10", ,envoy_cluster_name="a_inbound_cluster"} 29

envoy_cluster_upstream_rq_xx_filtered{envoy_response_code_class="2", app_version="1.0.1" , os_version="Android10", ,envoy_cluster_name="a_inbound_cluster"} 5
envoy_cluster_upstream_rq_xx_filtered{envoy_response_code_class="3", app_version="1.0.1" , os_version="Android10", ,envoy_cluster_name="a_inbound_cluster"} 0
envoy_cluster_upstream_rq_xx_filtered{envoy_response_code_class="5", app_version="1.0.1" , os_version="Android10", ,envoy_cluster_name="a_inbound_cluster"} 1

This is the one that I suggested.. headers (req, res) can be the labels of rq_*xx metrics...

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