Added ability to list all dtatbase with state, added metrics for database files (their sizes, names and types)

README.md

@@ -8,7 +8,9 @@ Prometheus exporter for Microsoft SQL Server (MSSQL). Exposes the following metr
 *  mssql_deadlocks Number of lock requests per second that resulted in a deadlock since last restart
 *  mssql_user_errors Number of user errors/sec since last restart
 *  mssql_kill_connection_errors Number of kill connection errors/sec since last restart
+*  mssql_database_state{database} State of each database (0=online 1=restoring 2=recovering 3=recovery pending 4=suspect 5=emergency 6=offline 7=copying 10=offline secondary)
 *  mssql_log_growths{database} Total number of times the transaction log for the database has been expanded last restart
+*  mssql_database_filesize{database,logicalname,type,filename} Physical sizes of files used by database in KB, their names and types (0=rows, 1=log, 2=filestream,3=n/a 4=fulltext(prior to version 2008 of MS SQL Server))
 *  mssql_page_life_expectancy Indicates the minimum number of seconds a page will stay in the buffer pool on this node without references. The traditional advice from Microsoft used to be that the PLE should remain above 300 seconds
 *  mssql_io_stall{database,type} Wait time (ms) of stall since last restart
 *  mssql_io_stall_total{database} Wait time (ms) of stall since last restart

metrics.js

@@ -83,6 +83,22 @@ where counter_name = 'Errors/sec' AND instance_name = 'Kill Connection Errors'`,
     }
 };
 
+const mssql_database_state = {
+    metrics: {
+        mssql_database_state: new client.Gauge({name: 'mssql_database_state', help: 'Databases states: 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 master.sys.databases`,
+    collect: function (rows, metrics) {
+        for (let i = 0; i < rows.length; i++) {
+            const row = rows[i];
+            const database = row[0].value;
+            const mssql_database_state = row[1].value;
+            debug("Fetch state for database", database);
+            metrics.mssql_database_state.set({database: database}, mssql_database_state);
+        }
+    }
+};
+
 const mssql_log_growths = {
     metrics: {
         mssql_log_growths: new client.Gauge({name: 'mssql_log_growths', help: 'Total number of times the transaction log for the database has been expanded last restart', labelNames: ['database']}),
@@ -101,6 +117,25 @@ and  instance_name <> '_Total'`,
     }
 };
 
+const mssql_database_filesize = {
+    metrics: {
+        mssql_database_filesize: new client.Gauge({name: 'mssql_database_filesize', help: 'Physical sizes of files used by database in KB, their names and types (0=rows, 1=log, 2=filestream,3=n/a 4=fulltext(before v2008 of MSSQL))', labelNames: ['database','logicalname','type','filename']}),
+    },
+    query: `SELECT DB_NAME(database_id) AS database_name, Name AS logical_name, type, physical_name, (size * 8) size_kb FROM sys.master_files`,
+    collect: function (rows, metrics) {
+        for (let i = 0; i < rows.length; i++) {
+            const row = rows[i];
+            const database = row[0].value;
+			const logicalname = row[1].value
+			const type = row[2].value
+			const filename = row[3].value
+			const mssql_database_filesize = row[4].value;
+            debug("Fetch size of files for database ", database);
+            metrics.mssql_database_filesize.set({database: database, logicalname: logicalname, type: type, filename: filename}, mssql_database_filesize);
+        }
+    }
+};
+
 const mssql_page_life_expectancy = {
     metrics: {
         mssql_page_life_expectancy: new client.Gauge({name: 'mssql_page_life_expectancy', help: 'Indicates the minimum number of seconds a page will stay in the buffer pool on this node without references. The traditional advice from Microsoft used to be that the PLE should remain above 300 seconds'})
@@ -209,7 +244,9 @@ const metrics = [
     mssql_deadlocks,
     mssql_user_errors,
     mssql_kill_connection_errors,
+    mssql_database_state,
     mssql_log_growths,
+    mssql_database_filesize,
     mssql_page_life_expectancy,
     mssql_io_stall,
     mssql_batch_requests,