SQL Server Input Plugin

The sqlserver plugin provides metrics for your SQL Server instance. It currently works with SQL Server 2008 SP3 and newer. Recorded metrics are lightweight and use Dynamic Management Views supplied by SQL Server.

Additional Setup:

You have to create a login on every instance you want to monitor, with following script:

USE master;
GO
CREATE LOGIN [telegraf] WITH PASSWORD = N'mystrongpassword';
GO
GRANT VIEW SERVER STATE TO [telegraf];
GO
GRANT VIEW ANY DEFINITION TO [telegraf];
GO

For Azure SQL Database, you require the View Database State permission and can create a user with a password directly in the database.

CREATE USER [telegraf] WITH PASSWORD = N'mystrongpassword';
GO
GRANT VIEW DATABASE STATE TO [telegraf];
GO

Configuration:

[agent]
  ## Default data collection interval for all inputs, can be changed as per collection interval needs
  interval = "10s"

# Read metrics from Microsoft SQL Server
[[inputs.sqlserver]]
  ## Specify instances to monitor with a list of connection strings.
  ## All connection parameters are optional.
  ## By default, the host is localhost, listening on default port, TCP 1433.
  ##   for Windows, the user is the currently running AD user (SSO).
  ##   See https://github.com/denisenkom/go-mssqldb for detailed connection
  ##   parameters.
  # servers = [
  #  "Server=192.168.1.10;Port=1433;User Id=<user>;Password=<pw>;app name=telegraf;log=1;",
  # ]

  ## Optional parameter, setting this to 2 will use a new version
  ## of the collection queries that break compatibility with the original
  ## dashboards. All new functionality is under V2
  query_version = 2

  ## If you are using AzureDB, setting this to true will gather resource utilization metrics
  # azuredb = false

  ## If you would like to exclude some of the metrics queries, list them here
  ## Possible choices:
  ## - PerformanceCounters
  ## - WaitStatsCategorized
  ## - DatabaseIO
  ## - DatabaseProperties
  ## - CPUHistory
  ## - DatabaseSize
  ## - DatabaseStats
  ## - MemoryClerk
  ## - VolumeSpace
  ## - Schedulers
  ## - AzureDBResourceStats
  ## - AzureDBResourceGovernance 
  exclude_query = [ 'Schedulers' ]

Metrics:

To provide backwards compatibility, this plugin support two versions of metrics queries.

Note: Version 2 queries are not backwards compatible with the old queries. Any dashboards or queries based on the old query format will not work with the new format. The version 2 queries are written in such a way as to only gather SQL specific metrics (no disk space or overall CPU related metrics) and they only report raw metrics, no math has been done to calculate deltas. To graph this data you must calculate deltas in your dashboarding software.

Version 1 (deprecated in 1.6):

The original metrics queries provide:

Performance counters: 1000+ metrics from sys.dm_os_performance_counters
Performance metrics: special performance and ratio metrics
Wait stats: wait tasks categorized from sys.dm_os_wait_stats
Memory clerk: memory breakdown from sys.dm_os_memory_clerks
Database size: databases size trend from sys.dm_io_virtual_file_stats
Database IO: databases I/O from sys.dm_io_virtual_file_stats
Database latency: databases latency from sys.dm_io_virtual_file_stats
Database properties: databases properties, state and recovery model, from sys.databases
OS Volume: available, used and total space from sys.dm_os_volume_stats
CPU: cpu usage from sys.dm_os_ring_buffers

If you are using the original queries all stats have the following tags:

servername: hostname:instance
type: type of stats to easily filter measurements

Version 2:

The new (version 2) metrics provide:

Database IO: IO stats from sys.dm_io_virtual_file_stats
Memory Clerk: Memory clerk breakdown from sys.dm_os_memory_clerks, most clerks have been given a friendly name.
Performance Counters: A select list of performance counters from sys.dm_os_performance_counters. Some of the important metrics included:
- Activity: Transactions/sec/database, Batch requests/sec, blocked processes, + more
- Availability Groups: Bytes sent to replica, Bytes received from replica, Log bytes received, Log send queue, transaction delay, + more
- Log activity: Log bytes flushed/sec, Log flushes/sec, Log Flush Wait Time
- Memory: PLE, Page reads/sec, Page writes/sec, + more
- TempDB: Free space, Version store usage, Active temp tables, temp table creation rate, + more
- Resource Governor: CPU Usage, Requests/sec, Queued Requests, and Blocked tasks per workload group + more
Server properties: Number of databases in all possible states (online, offline, suspect, etc.), cpu count, physical memory, SQL Server service uptime, and SQL Server version. In the case of Azure SQL relevent properties such as Tier, #Vcores, Memory etc.
Wait stats: Wait time in ms, number of waiting tasks, resource wait time, signal wait time, max wait time in ms, wait type, and wait category. The waits are categorized using the same categories used in Query Store.
Schedulers - This captures sys.dm_os_schedulers.
Azure Managed Instances
- Stats from sys.server_resource_stats:
  - cpu_count
  - server_memory
  - sku
  - engine_edition
  - hardware_type
  - total_storage_mb
  - available_storage_mb
  - uptime
- Resource governance stats from sys.dm_instance_resource_governance
Azure SQL Database
- Stats from sys.dm_db_wait_stats
- Resource governance stats from sys.dm_user_db_resource_governance
- Stats from sys.dm_db_resource_stats

The following metrics can be used directly, with no delta calculations:

SQLServer:Buffer Manager\Buffer cache hit ratio
SQLServer:Buffer Manager\Page life expectancy
SQLServer:Buffer Node\Page life expectancy
SQLServer:Database Replica\Log Apply Pending Queue
SQLServer:Database Replica\Log Apply Ready Queue
SQLServer:Database Replica\Log Send Queue
SQLServer:Database Replica\Recovery Queue
SQLServer:Databases\Data File(s) Size (KB)
SQLServer:Databases\Log File(s) Size (KB)
SQLServer:Databases\Log File(s) Used Size (KB)
SQLServer:Databases\XTP Memory Used (KB)
SQLServer:General Statistics\Active Temp Tables
SQLServer:General Statistics\Processes blocked
SQLServer:General Statistics\Temp Tables For Destruction
SQLServer:General Statistics\User Connections
SQLServer:Memory Broker Clerks\Memory broker clerk size
SQLServer:Memory Manager\Memory Grants Pending
SQLServer:Memory Manager\Target Server Memory (KB)
SQLServer:Memory Manager\Total Server Memory (KB)
SQLServer:Resource Pool Stats\Active memory grant amount (KB)
SQLServer:Resource Pool Stats\Disk Read Bytes/sec
SQLServer:Resource Pool Stats\Disk Read IO Throttled/sec
SQLServer:Resource Pool Stats\Disk Read IO/sec
SQLServer:Resource Pool Stats\Disk Write Bytes/sec
SQLServer:Resource Pool Stats\Disk Write IO Throttled/sec
SQLServer:Resource Pool Stats\Disk Write IO/sec
SQLServer:Resource Pool Stats\Used memory (KB)
SQLServer:Transactions\Free Space in tempdb (KB)
SQLServer:Transactions\Version Store Size (KB)
SQLServer:User Settable\Query
SQLServer:Workload Group Stats\Blocked tasks
SQLServer:Workload Group Stats\CPU usage %
SQLServer:Workload Group Stats\Queued requests
SQLServer:Workload Group Stats\Requests completed/sec

Version 2 queries have the following tags:

sql_instance: Physical host and instance name (hostname:instance)
database_name: For Azure SQLDB, database_name denotes the name of the Azure SQL Database as server name is a logical construct.

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