Back off improvement

Cargo.toml

@@ -20,6 +20,8 @@ kitsune2_api = { version = "0.0.1-alpha", path = "crates/api" }
 async-channel = "2.3.1"
 # this is used by bootstrap_srv as the http server implementation.
 axum = { version = "0.7.9", default-features = false }
+# used by fetch module to back off requests to unresponsive agents
+backon = "1.3"
 # debugging is far easier when you can see short byte arrays
 # as base64 instead of decimal u8s.
 base64 = "0.22.1"

crates/core/Cargo.toml

@@ -11,6 +11,7 @@ categories = ["network-programming"]
 edition = "2021"
 
 [dependencies]
+backon = { workspace = true }
 bytes = { workspace = true }
 ed25519-dalek = { workspace = true }
 futures = { workspace = true }