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Add EWMA and load biasing crates for failure-aware P2C balancing #4537

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Add EWMA and load biasing crates for failure-aware P2C balancing #4537

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5f971f6
feat(ewma): add base EWMA crate
unleashed May 21, 2026
6cc6022
feat(ewma): add success-rate tracking extensions
unleashed May 21, 2026
0348546
feat(classify): add Retry-After and gRPC pushback parsers
unleashed May 7, 2026
8a7fbb2
feat(load-biaser): add load biasing crate with RTT tracking and failu…
unleashed May 21, 2026
c40a0af
test(load-biaser): add unit tests for load biasing lifecycle
unleashed May 21, 2026
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26 changes: 26 additions & 0 deletions Cargo.lock
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Original file line number Diff line number Diff line change
Expand Up @@ -1687,6 +1687,13 @@ dependencies = [
"pin-project",
]

[[package]]
name = "linkerd-ewma"
version = "0.1.0"
dependencies = [
"tokio",
]

[[package]]
name = "linkerd-exp-backoff"
version = "0.1.0"
Expand Down Expand Up @@ -1751,6 +1758,7 @@ dependencies = [
"futures",
"http",
"http-body",
"httpdate",
"linkerd-error",
"linkerd-http-box",
"linkerd-stack",
Expand Down Expand Up @@ -1979,6 +1987,24 @@ dependencies = [
"tokio-util",
]

[[package]]
name = "linkerd-load-biaser"
version = "0.1.0"
dependencies = [
"futures",
"http",
"linkerd-ewma",
"linkerd-http-classify",
"linkerd-stack",
"parking_lot",
"pin-project",
"tokio",
"tokio-test",
"tower",
"tower-service",
"tracing",
]

[[package]]
name = "linkerd-meshtls"
version = "0.1.0"
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3 changes: 3 additions & 0 deletions Cargo.toml
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Expand Up @@ -22,6 +22,7 @@ members = [
"linkerd/error",
"linkerd/errno",
"linkerd/error-respond",
"linkerd/ewma",
"linkerd/exp-backoff",
"linkerd/http/access-log",
"linkerd/http/body-eos",
Expand All @@ -42,6 +43,7 @@ members = [
"linkerd/identity",
"linkerd/idle-cache",
"linkerd/io",
"linkerd/load-biaser",
"linkerd/meshtls",
"linkerd/meshtls/verifier",
"linkerd/metrics",
Expand Down Expand Up @@ -105,6 +107,7 @@ drain = { version = "0.2", default-features = false }
h2 = { version = "0.4" }
http = { version = "1" }
http-body = { version = "1" }
httpdate = { version = "1.0" }
hyper = { version = "1", default-features = false }
prometheus-client = { version = "0.23" }
prost = { version = "0.14" }
Expand Down
13 changes: 13 additions & 0 deletions linkerd/ewma/Cargo.toml
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@@ -0,0 +1,13 @@
[package]
name = "linkerd-ewma"
version = { workspace = true }
authors = { workspace = true }
license = { workspace = true }
edition = { workspace = true }
publish = { workspace = true }

[dependencies]
tokio = { version = "1", features = ["time"] }
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@cratelyn cratelyn May 22, 2026

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maybe default-features = false would be nice here too, since we're not setting up a runtime or anything else in this crate. time interfaces seem like all we're using here!


[dev-dependencies]
tokio = { version = "1", features = ["macros", "rt", "test-util"] }
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