[dxm-132] update docs for histogram buckets and timeout settings

[the-gigi-apollo]

[dxm-132] update docs for histogram buckets and timeout settings

[apollo-librarian]

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* graphos/routing/(latest)/license.mdx
* graphos/routing/(latest)/configuration/envvars.mdx
* graphos/routing/(latest)/observability/router-telemetry-otel/telemetry-pipelines/metrics-exporters/overview.mdx
* graphos/routing/(latest)/self-hosted/index.mdx

Build ID: d82dddb977301ef0094180de
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URL: https://www.apollographql.com/docs/deploy-preview/d82dddb977301ef0094180de

[bonnici]

Minor correction here, the bucket values are correct (see https://github.com/apollographql/router/blob/dev/apollo-router/src/plugins/telemetry/metrics/apollo/mod.rs#L40-L44) but buckets are represented in the metrics as "less than or equal to" the specified bucket boundaries. Values higher than the largest bucket will be put into a "less than or equal to infinity" bucket. As a sample here are some prometheus metrics I just saw when I was doing some testing:

http_server_request_duration_seconds_bucket{http_request_method="POST",http_response_status_code="200",server_address="10.89.1.14",server_port="4000",otel_scope_name="apollo/router",le="0.001"} 0
http_server_request_duration_seconds_bucket{http_request_method="POST",http_response_status_code="200",server_address="10.89.1.14",server_port="4000",otel_scope_name="apollo/router",le="0.005"} 0
http_server_request_duration_seconds_bucket{http_request_method="POST",http_response_status_code="200",server_address="10.89.1.14",server_port="4000",otel_scope_name="apollo/router",le="0.015"} 1
http_server_request_duration_seconds_bucket{http_request_method="POST",http_response_status_code="200",server_address="10.89.1.14",server_port="4000",otel_scope_name="apollo/router",le="0.05"} 1
http_server_request_duration_seconds_bucket{http_request_method="POST",http_response_status_code="200",server_address="10.89.1.14",server_port="4000",otel_scope_name="apollo/router",le="0.1"} 2
http_server_request_duration_seconds_bucket{http_request_method="POST",http_response_status_code="200",server_address="10.89.1.14",server_port="4000",otel_scope_name="apollo/router",le="0.2"} 2
http_server_request_duration_seconds_bucket{http_request_method="POST",http_response_status_code="200",server_address="10.89.1.14",server_port="4000",otel_scope_name="apollo/router",le="0.3"} 2
http_server_request_duration_seconds_bucket{http_request_method="POST",http_response_status_code="200",server_address="10.89.1.14",server_port="4000",otel_scope_name="apollo/router",le="0.4"} 2
http_server_request_duration_seconds_bucket{http_request_method="POST",http_response_status_code="200",server_address="10.89.1.14",server_port="4000",otel_scope_name="apollo/router",le="0.5"} 2
http_server_request_duration_seconds_bucket{http_request_method="POST",http_response_status_code="200",server_address="10.89.1.14",server_port="4000",otel_scope_name="apollo/router",le="1"} 2
http_server_request_duration_seconds_bucket{http_request_method="POST",http_response_status_code="200",server_address="10.89.1.14",server_port="4000",otel_scope_name="apollo/router",le="5"} 2
http_server_request_duration_seconds_bucket{http_request_method="POST",http_response_status_code="200",server_address="10.89.1.14",server_port="4000",otel_scope_name="apollo/router",le="10"} 2
http_server_request_duration_seconds_bucket{http_request_method="POST",http_response_status_code="200",server_address="10.89.1.14",server_port="4000",otel_scope_name="apollo/router",le="+Inf"} 2

[the-gigi-apollo]

@bonnici thanks for the explanation and example. I updated the text to reflect your comment.