refactor!: make global core optional, add derive macro, add MetricsGroup and MetricsGroupSet traits, reoganize modules

Cargo.toml

@@ -1,3 +1,6 @@
+[workspace]
+members = ["iroh-metrics-derive"]
+
 [package]
 name = "iroh-metrics"
 version = "0.32.0"
@@ -27,22 +30,26 @@ unexpected_cfgs = { level = "warn", check-cfg = ["cfg(iroh_docsrs)"] }
 unused-async = "warn"
 
 [dependencies]
-erased_set = "0.8"
 serde = { version = "1", features = ["derive"] }
-struct_iterable = "0.1"
 thiserror = "2.0.6"
 tracing = "0.1"
 
 # metrics feature
 prometheus-client = { version = "0.22", optional = true }
 
+# static_core feature
+erased_set = { version = "0.8", optional = true }
+
 # service feature
 http-body-util = { version = "0.1.0", optional = true }
 hyper = { version = "1", features = ["server", "http1"], optional = true }
 hyper-util = { version = "0.1.1", features = ["tokio"], optional = true }
 reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"], optional = true }
 tokio = { version = "1", features = ["rt", "net", "fs"], optional = true }
 
+# derive feature
+iroh-metrics-derive = { path = "./iroh-metrics-derive" }
+
 [dev-dependencies]
 tokio = { version = "1", features = ["io-util", "sync", "rt", "net", "fs", "macros", "time", "test-util"] }
 
@@ -64,6 +71,8 @@ service = [
     "dep:reqwest",
     "dep:tokio",
 ]
+# Enables a global, static metrics collector
+static_core = ["metrics", "dep:erased_set"]
 
 [package.metadata.docs.rs]
 all-features = true

deny.toml

@@ -10,7 +10,6 @@ allow = [
     "BSL-1.0",                        # BOSL license
     "ISC",
     "MIT",
-    "OpenSSL",
     "Zlib",
     "MPL-2.0",                        # https://fossa.com/blog/open-source-software-licenses-101-mozilla-public-license-2-0/
     "Unicode-3.0",

iroh-metrics-derive/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "iroh-metrics-derive"
+version = "0.1.0"
+edition = "2021"
+description = "derive macros for iroh-metrics"
+license = "MIT OR Apache-2.0"
+authors = ["Frando <[email protected]>", "n0 team"]
+repository = "https://github.com/n0-computer/iroh-metrics"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+heck = "0.5"
+proc-macro2 = "1"
+quote = "1"
+syn = "2"