Add metrics

Change dashboards to load an index.html file compiled otherwise

web/src/routes/metrics.rs

@@ -0,0 +1,18 @@
+use prometheus;
+
+use crate::metrics::REGISTRY;
+
+#[get("/metrics")]
+pub async fn metrics() -> String {
+    let encoder = prometheus::TextEncoder::new();
+    let res_custom = encoder.encode_to_string(&REGISTRY.gather());
+
+    match res_custom {
+        Ok(s) => s,
+        Err(e) => {
+            warn!("Error encoding metrics: {:?}", e);
+
+            String::new()
+        }
+    }
+}