Add database state metric (#15)

Optimize dockerfile
Add .dockerignore to speed up builds, ignoring .git, and node_modules
Add database state metric

Co-authored-by: Pierre Awaragi <pierre@awaragi.com>

.dockerignore

@@ -0,0 +1,2 @@
+.git
+node_modules

Dockerfile

@@ -8,7 +8,7 @@ RUN mkdir -p /usr/src/app
 # Change directory so that our commands run inside this new directory
 WORKDIR /usr/src/app
 
-# Copy dependency definitions
+# Copy application
 COPY package.json *.js ./
 
 # Install dependecies

metrics.js

@@ -269,6 +269,21 @@ from sys.dm_os_sys_memory`,
   },
 };
 
+const mssql_database_state = {
+    metrics: {
+        mssql_database_state: new client.Gauge({name: 'mssql_database_state', help: 'State of databases: 0 = ONLINE, 1 = RESTORING, 2 = RECOVERING 3 = RECOVERY_PENDING 4 = SUSPECT 5 = EMERGENCY 6 = OFFLINE 7 = COPYING 10 = OFFLINE_SECONDARY', labelNames: ['database']})
+    },
+    query: `select name, state from sys.databases;`,
+    collect: function (rows, metrics) {
+        for (let i = 0; i < rows.length; i++) {
+            const row = rows[i];
+            const database = row[0].value;
+            const state = row[1].value;
+            metrics.mssql_database_state.set({database: database}, state);
+        }
+    }
+};
+
 const metrics = [
   mssql_instance_local_time,
   mssql_connections,
@@ -283,6 +298,7 @@ const metrics = [
   mssql_batch_requests,
   mssql_os_process_memory,
   mssql_os_sys_memory,
+  mssql_database_state,
 ];
 
 module.exports = {