update metriken to replace heatmaps with histograms (#103)

Updates metriken to replace heatmaps with histograms. Reduces the runtime performance overhead of metrics.

Cargo.toml

@@ -6,6 +6,7 @@ repository = "https://github.com/pelikan-io/pelikan"
 license = "Apache-2.0"
 
 [workspace]
+resolver = "2"
 members = [
     "src/common",
     "src/config",
@@ -55,17 +56,18 @@ httparse = "1.8.0"
 libc = "0.2.139"
 log = "0.4.17"
 memmap2 = "0.5.8"
-metriken = "0.2.3"
+metriken = "0.3.0"
 metrohash = "1.0.6"
 mio = "0.8.5"
 nom = "7.1.3"
+parking_lot = "0.12.1"
 phf = "0.11.1"
 proc-macro2 = "1.0.50"
 quote = "1.0.23"
 rand = "0.8.5"
 rand_chacha = "0.3.1"
 rand_xoshiro = "0.6.0"
-ringlog = "0.2.0"
+ringlog = "0.3.0"
 serde = "1.0.152"
 serde_json = "1.0.91"
 signal-hook = "0.3.15"

src/common/src/ssl.rs

@@ -5,7 +5,7 @@
 pub use boring::ssl::*;
 
 use net::TlsTcpAcceptor;
-use std::io::{Error, ErrorKind};
+use std::io::{Error as IoError, ErrorKind as IoErrorKind};
 
 pub trait TlsConfig {
     fn certificate_chain(&self) -> Option<String>;
@@ -21,14 +21,17 @@ pub trait TlsConfig {
 /// there were any issues during initialization. Otherwise, returns a
 /// `TlsTcpAcceptor` wrapped in an option, where the `None` variant indicates
 /// that TLS should not be used.
-pub fn tls_acceptor(config: &dyn TlsConfig) -> Result<Option<TlsTcpAcceptor>, std::io::Error> {
+pub fn tls_acceptor(config: &dyn TlsConfig) -> Result<Option<TlsTcpAcceptor>, IoError> {
     let mut builder = TlsTcpAcceptor::mozilla_intermediate_v5()?;
 
     // we use xor here to check if we have an under-specified tls configuration
     if config.private_key().is_some()
         ^ (config.certificate_chain().is_some() || config.certificate().is_some())
     {
-        return Err(Error::new(ErrorKind::Other, "incomplete tls configuration"));
+        return Err(IoError::new(
+            IoErrorKind::Other,
+            "incomplete tls configuration",
+        ));
     }
 
     // load the private key

src/core/admin/Cargo.toml

@@ -17,6 +17,7 @@ libc = { workspace = true }
 logger = { path = "../../logger" }
 metriken = { workspace = true }
 net = { path = "../../net" }
+parking_lot = { workspace = true }
 protocol-admin = { path = "../../protocol/admin" }
 protocol-common = { path = "../../protocol/common" }
 session = { path = "../../session" }