remove unnecessary dependencies, put prefix on log handler when flattening

Cargo.lock

@@ -185,7 +185,6 @@ checksum = "a6139a8597ed92cf816dfb33f5dd6cf0bb93a6adc938f11039f371bc5bcd26c3"
 dependencies = [
  "chrono",
  "phf",
- "serde",
 ]
 
 [[package]]

Cargo.toml

@@ -26,7 +26,7 @@ prometheus-http-client = { path = "prometheus-http-client", default-features = f
 
 async-trait = "0.1"
 chrono = { version = "0.4", default-features = false, features = ["clock", "serde", "std"] }
-chrono-tz = { version = "0.10", features = ["serde"] }
+chrono-tz = "0.10"
 conf = { version = "0.4", features = ["serde"] }
 conf-extra = "0.1"
 displaydoc = "0.2"

signal-gateway/src/gateway/mod.rs

@@ -77,7 +77,7 @@ pub struct GatewayConfig {
     #[conf(flatten)]
     pub prometheus: Option<PrometheusConfig>,
     /// Log handler configuration for processing log messages.
-    #[conf(flatten)]
+    #[conf(flatten, prefix)]
     pub log_handler: LogHandlerConfig,
 }