Remove CIR

src/metrics.rs

@@ -36,13 +36,6 @@ async fn handle_client_connection(
     varz.uptime.set(uptime as f64);
     let client_queries = varz.client_queries_udp.get() + varz.client_queries_tcp.get();
     varz.client_queries.set(client_queries);
-    let cached_queries = varz.client_queries_cached.get();
-    let cache_hit_ratio = if client_queries <= 0.0 {
-        0.0
-    } else {
-        cached_queries as f64 * 100.0 / client_queries as f64
-    };
-    varz.cache_hit_ratio.set(cache_hit_ratio);
     let metric_families = prometheus::gather();
     let encoder = TextEncoder::new();
     encoder.encode(&metric_families, &mut buffer)?;

src/varz.rs

@@ -7,7 +7,6 @@ pub struct StartInstant(pub Instant);
 pub struct Inner {
     pub start_instant: StartInstant,
     pub uptime: Gauge,
-    pub cache_hit_ratio: Gauge,
     pub client_queries: Gauge,
     pub client_queries_udp: Counter,
     pub client_queries_tcp: Counter,
@@ -46,12 +45,6 @@ impl Inner {
                 labels! {"handler" => "all",}
             ))
             .unwrap(),
-            cache_hit_ratio: register_gauge!(opts!(
-                "encrypted_dns_cache_hit_ratio",
-                "Cache hit ratio",
-                labels! {"handler" => "all",}
-            ))
-            .unwrap(),
             client_queries_udp: register_counter!(opts!(
                 "encrypted_dns_client_queries_udp",
                 "Number of client queries received \