-- ===================================================================================================================
-- Collector: AvailabilityGroupCollector ("availability-groups")
-- ===================================================================================================================
-- Hvad:        Always On: replikaer, databasereplikaer (køer, hastigheder, commit-tid) og Windows-clusterets
--              medlemmer.
-- Fil:         src/SQLInsight.Collectors/Instance/AvailabilityGroupCollector.cs
-- Interval:    1 min som standard (SQLInsight:CollectorIntervals:availability-groups)
-- Versioner:   SQL Server 2012 og nyere med Always On slået til
--
-- Rettigheder til agentens login (se db/permissions/grant-least-privilege.sql; [agent] = agentens login):
--   GRANT VIEW SERVER STATE TO [agent];                -- SQL Server 2005-2019
--   GRANT VIEW SERVER PERFORMANCE STATE TO [agent];    -- SQL Server 2022+ (erstatter VIEW SERVER STATE)
--   GRANT VIEW SERVER SECURITY STATE TO [agent];       -- SQL Server 2022+
--   GRANT VIEW ANY DEFINITION TO [agent];              -- metadata; giver IKKE adgang til data
--
-- Bruges af:   SQLI-AG-003, SQLI-AG-001, SQLI-AG-002
-- Read-only:   Ja: kun SELECT samt SET-sessionsindstillinger. Intet ændrer data, indstillinger eller objekter.
-- Kørsel:     Kør i SSMS som agentens login. Hver variant er sin egen batch (GO); en variant for en anden SQL Server-version
--             end din kan fejle - det er forventet. Agenten kører altid med sessionsindstillingerne i _collectors/InstanceProbe.sql.
-- ===================================================================================================================

-- Variant: SQL Server 2012 og nyere med Always On slået til
-- Kilde: AvailabilityGroupCollector.ReplicasSql
-- Kode:  src/SQLInsight.Collectors/Instance/AvailabilityGroupCollector.cs : AvailabilityGroupCollector.ReplicasSql
SELECT ag.name, ar.replica_server_name, ars.is_local, ars.role_desc, ars.connected_state_desc, ars.synchronization_health_desc,
       ar.availability_mode_desc, ar.failover_mode_desc
FROM sys.availability_groups ag
JOIN sys.availability_replicas ar ON ar.group_id = ag.group_id
LEFT JOIN sys.dm_hadr_availability_replica_states ars ON ars.replica_id = ar.replica_id
GO

-- Variant: SQL Server 2012 og nyere med Always On slået til
-- Kilde: AvailabilityGroupCollector.DatabasesSql
-- Kode:  src/SQLInsight.Collectors/Instance/AvailabilityGroupCollector.cs : AvailabilityGroupCollector.DatabasesSql
SELECT ag.name, DB_NAME(drs.database_id), ar.replica_server_name, drs.is_local,
       CASE WHEN ars.role = 1 THEN 1 ELSE 0 END,
       drs.synchronization_state_desc, drs.synchronization_health_desc, drs.is_suspended, drs.suspend_reason_desc,
       drs.log_send_queue_size, drs.log_send_rate, drs.redo_queue_size, drs.redo_rate, drs.last_commit_time
FROM sys.dm_hadr_database_replica_states drs
JOIN sys.availability_replicas ar ON ar.replica_id = drs.replica_id
JOIN sys.availability_groups ag ON ag.group_id = drs.group_id
LEFT JOIN sys.dm_hadr_availability_replica_states ars ON ars.replica_id = drs.replica_id
GO

-- Variant: SQL Server 2012 og nyere med Always On slået til (tom uden Windows-cluster)
-- Kilde: AvailabilityGroupCollector.ClusterMembersSql
-- Kode:  src/SQLInsight.Collectors/Instance/AvailabilityGroupCollector.cs : AvailabilityGroupCollector.ClusterMembersSql
SELECT member_name, member_type_desc, member_state, member_state_desc, number_of_quorum_votes FROM sys.dm_hadr_cluster_members
GO