refactor(app/outbound): simplify backend metrics layer #4299
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this is akin to #3334, which cleaned up the equivalent expression in `linkerd/app/outbound/src/http/logical/policy/route/metrics.rs`. Signed-off-by: katelyn martin <[email protected]>
before we introduce additional layers to our backend stack, we should define type aliases as prophylaxis against: <https://rust-lang.github.io/rust-clippy/stable/index.html#type_complexity> Signed-off-by: katelyn martin <[email protected]>
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…e` (#4300) **nb:** this branch is based upon #4299, and #4298. in #4299 we made some prepatory adjustments to the outbound proxy's route-backend metrics layer, and in #4298 we introduced a new `linker-http-prom::status` metrics layer that can be used to count response status codes, in a manner that is agnostic with respect to the particular protocol that instrumented traffic is using. this branch performs a sequences of changes oriented towards two concrete goals: **1:** integrate the `NewRecordStatusCode` middleware into the outbound proxy's route and backend metrics layers, and **2:** remove status code measurement from the `NewRecordResponse` middleware. it's worth stating explicitly that this maintains the existing behavior of the outbound proxy, and that (1) and (2) must be performed at the same time to maintain parity. <img width="498" height="262" alt="image" src="https://github.com/user-attachments/assets/5030e7cd-33df-4cc3-b5cc-5f4db8247bd5" /> to demonstrate that parity is maintained, let's compare metrics from this branch against a snapshot of metrics exported in `main`. **🟰 comparing the metrics** metrics were scraped from the proxy, using a small traffic generation deployment that runs `curl` against a container running `http-echo`. a snapshot of the route and backend status/duration counters on main: ``` # HELP outbound_http_route_request_duration_seconds The time between request initialization and response completion. # TYPE outbound_http_route_request_duration_seconds histogram # UNIT outbound_http_route_request_duration_seconds seconds outbound_http_route_request_duration_seconds_sum{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} 0.5594713199999999 outbound_http_route_request_duration_seconds_count{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} 284 outbound_http_route_request_duration_seconds_bucket{le="0.05",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} 284 outbound_http_route_request_duration_seconds_bucket{le="0.5",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} 284 outbound_http_route_request_duration_seconds_bucket{le="1.0",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} 284 outbound_http_route_request_duration_seconds_bucket{le="10.0",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} 284 outbound_http_route_request_duration_seconds_bucket{le="+Inf",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} 284 # HELP outbound_http_route_request_statuses Completed request-response streams. # TYPE outbound_http_route_request_statuses counter outbound_http_route_request_statuses_total{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname="",http_status="200",error=""} 284 # HELP outbound_http_route_backend_response_duration_seconds The time between request completion and response completion. # TYPE outbound_http_route_backend_response_duration_seconds histogram # UNIT outbound_http_route_backend_response_duration_seconds seconds outbound_http_route_backend_response_duration_seconds_sum{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 0.4626854930000003 outbound_http_route_backend_response_duration_seconds_count{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 284 outbound_http_route_backend_response_duration_seconds_bucket{le="0.025",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 284 outbound_http_route_backend_response_duration_seconds_bucket{le="0.05",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 284 outbound_http_route_backend_response_duration_seconds_bucket{le="0.1",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 284 outbound_http_route_backend_response_duration_seconds_bucket{le="0.25",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 284 outbound_http_route_backend_response_duration_seconds_bucket{le="0.5",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 284 outbound_http_route_backend_response_duration_seconds_bucket{le="1.0",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 284 outbound_http_route_backend_response_duration_seconds_bucket{le="10.0",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 284 outbound_http_route_backend_response_duration_seconds_bucket{le="+Inf",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 284 # HELP outbound_http_route_backend_response_statuses Completed responses. # TYPE outbound_http_route_backend_response_statuses counter outbound_http_route_backend_response_statuses_total{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name="",http_status="200",error=""} 284 ``` this was repeated after applying `config.linkerd.io/proxy-version` to use a proxy with these patches applied. a snapshot of the route and backend status/duration counters with these changes: ``` # HELP outbound_http_route_request_duration_seconds The time between request initialization and response completion. # TYPE outbound_http_route_request_duration_seconds histogram # UNIT outbound_http_route_request_duration_seconds seconds outbound_http_route_request_duration_seconds_sum{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} 0.2557158190000001 outbound_http_route_request_duration_seconds_count{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} 128 outbound_http_route_request_duration_seconds_bucket{le="0.05",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} 128 outbound_http_route_request_duration_seconds_bucket{le="0.5",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} 128 outbound_http_route_request_duration_seconds_bucket{le="1.0",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} 128 outbound_http_route_request_duration_seconds_bucket{le="10.0",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} 128 outbound_http_route_request_duration_seconds_bucket{le="+Inf",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} 128 # HELP outbound_http_route_request_statuses Completed request-response streams. # TYPE outbound_http_route_request_statuses counter outbound_http_route_request_statuses_total{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname="",http_status="200",error=""} 128 # HELP outbound_http_route_backend_response_duration_seconds The time between request completion and response completion. # TYPE outbound_http_route_backend_response_duration_seconds histogram # UNIT outbound_http_route_backend_response_duration_seconds seconds outbound_http_route_backend_response_duration_seconds_sum{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 0.209469089 outbound_http_route_backend_response_duration_seconds_count{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 128 outbound_http_route_backend_response_duration_seconds_bucket{le="0.025",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 128 outbound_http_route_backend_response_duration_seconds_bucket{le="0.05",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 128 outbound_http_route_backend_response_duration_seconds_bucket{le="0.1",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 128 outbound_http_route_backend_response_duration_seconds_bucket{le="0.25",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 128 outbound_http_route_backend_response_duration_seconds_bucket{le="0.5",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 128 outbound_http_route_backend_response_duration_seconds_bucket{le="1.0",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 128 outbound_http_route_backend_response_duration_seconds_bucket{le="10.0",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 128 outbound_http_route_backend_response_duration_seconds_bucket{le="+Inf",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 128 # HELP outbound_http_route_backend_response_statuses Completed responses. # TYPE outbound_http_route_backend_response_statuses counter outbound_http_route_backend_response_statuses_total{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name="",http_status="200",error=""} 128 ``` because there are a large number of metrics and labels, a character-level diff of the two looked like so. as we'd hope, the only differences observed were values of particular time series. in other words, the same traffic yielded the same number of time series with the same labels. ``` diff --git a/recorded.txt b/recorded.txt index 41d4c53..5bf5c13 100644 --- a/recorded.txt +++ b/recorded.txt @@ -1,29 +1,29 @@ # HELP outbound_http_route_request_duration_seconds The time between request initialization and response completion. # TYPE outbound_http_route_request_duration_seconds histogram # UNIT outbound_http_route_request_duration_seconds seconds outbound_http_route_request_duration_seconds_sum{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} 0.{+2+}55[-94-]71[-3-]{+58+}19[-9999999-]{+0000001+} outbound_http_route_request_duration_seconds_count{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} {+1+}28[-4-] outbound_http_route_request_duration_seconds_bucket{le="0.05",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} {+1+}28[-4-] outbound_http_route_request_duration_seconds_bucket{le="0.5",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} {+1+}28[-4-] outbound_http_route_request_duration_seconds_bucket{le="1.0",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} {+1+}28[-4-] outbound_http_route_request_duration_seconds_bucket{le="10.0",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} {+1+}28[-4-] outbound_http_route_request_duration_seconds_bucket{le="+Inf",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname=""} {+1+}28[-4-] # HELP outbound_http_route_request_statuses Completed request-response streams. # TYPE outbound_http_route_request_statuses counter outbound_http_route_request_statuses_total{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",hostname="",http_status="200",error=""} {+1+}28[-4-] # HELP outbound_http_route_backend_response_duration_seconds The time between request completion and response completion. # TYPE outbound_http_route_backend_response_duration_seconds histogram # UNIT outbound_http_route_backend_response_duration_seconds seconds outbound_http_route_backend_response_duration_seconds_sum{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} 0.[-46-]2[-685-]{+09+}4{+6+}9[-30-]0[-00003-]{+89+} outbound_http_route_backend_response_duration_seconds_count{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} {+1+}28[-4-] outbound_http_route_backend_response_duration_seconds_bucket{le="0.025",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} {+1+}28[-4-] outbound_http_route_backend_response_duration_seconds_bucket{le="0.05",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} {+1+}28[-4-] outbound_http_route_backend_response_duration_seconds_bucket{le="0.1",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} {+1+}28[-4-] outbound_http_route_backend_response_duration_seconds_bucket{le="0.25",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} {+1+}28[-4-] outbound_http_route_backend_response_duration_seconds_bucket{le="0.5",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} {+1+}28[-4-] outbound_http_route_backend_response_duration_seconds_bucket{le="1.0",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} {+1+}28[-4-] outbound_http_route_backend_response_duration_seconds_bucket{le="10.0",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} {+1+}28[-4-] outbound_http_route_backend_response_duration_seconds_bucket{le="+Inf",parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name=""} {+1+}28[-4-] # HELP outbound_http_route_backend_response_statuses Completed responses. # TYPE outbound_http_route_backend_response_statuses counter outbound_http_route_backend_response_statuses_total{parent_group="core",parent_kind="Service",parent_namespace="simple-app",parent_name="simple-app-v1",parent_port="80",parent_section_name="",route_group="",route_kind="default",route_namespace="",route_name="http",backend_group="core",backend_kind="Service",backend_namespace="simple-app",backend_name="simple-app-v1",backend_port="80",backend_section_name="",http_status="200",error=""} {+1+}28[-4-] ``` --- * feat(app/outbound): add status counters to route metrics Signed-off-by: katelyn martin <[email protected]> * feat(app/outbound): add status counters to backend metrics Signed-off-by: katelyn martin <[email protected]> * feat(app/outbound): add route status counting middleware Signed-off-by: katelyn martin <[email protected]> * feat(app/outbound): add backend status counting middleware Signed-off-by: katelyn martin <[email protected]> * refactor(app/outbound): remove status counter from duration middleware Signed-off-by: katelyn martin <[email protected]> * nit(http/prom): nitpick a todo comment Signed-off-by: katelyn martin <[email protected]> --------- Signed-off-by: katelyn martin <[email protected]>
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this branch makes some small preliminary changes to the outbound proxy's
backend metrics layer.
this will simplify the introduction of additional middleware layers.
refactor(app/outbound): simplify backend layer construction
this is akin to feat(app): Route frame count metrics #3334, which cleaned up the equivalent expression in
linkerd/app/outbound/src/http/logical/policy/route/metrics.rs.Signed-off-by: katelyn martin [email protected]
refactor(app/outbound): type aliases in backend metrics layer
before we introduce additional layers to our backend stack, we should
define type aliases as prophylaxis against:
https://rust-lang.github.io/rust-clippy/stable/index.html#type_complexity
Signed-off-by: katelyn martin [email protected]