sqld: add version label

Author: LucioFranco

libsql-server/src/http/admin/mod.rs

@@ -72,6 +72,7 @@ where
     C: Connector,
 {
     let app_label = std::env::var("SQLD_APP_LABEL").ok();
+    let ver = env!("CARGO_PKG_VERSION");
 
     let prom_handle = if !disable_metrics {
         let lock = PROM_HANDLE.lock();
@@ -84,6 +85,7 @@ where
 
             if let Some(app_label) = app_label {
                 b.add_global_label("app", app_label)
+                    .add_global_label("version", ver)
                     .install_recorder()
                     .unwrap()
             } else {
@@ -95,6 +97,8 @@ where
         None
     };
 
+    metrics::increment_counter!("libsql_server_count");
+
     use axum::routing::{get, post};
     let metrics = Metrics {
         handle: prom_handle,