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Merge pull request #226398 from varun-dhawan/varun-azure-docs-pr
[Azure-PG-Flex] - updates the details for autovacuum metrics
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‎articles/postgresql/flexible-server/concepts-monitoring.md

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@@ -56,10 +56,10 @@ Introducing Enhanced Metrics for Azure Database for PostgreSQL Flexible Server t
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#### List of enhanced metrics
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##### `Activity`
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##### Activity
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|Display Name |Metric ID |Unit |Description |Dimension |Default enabled |
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|-----------------------------------|----------------------------|-------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|------------------|
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|Display Name |Metric ID |Unit |Description |Dimension |Default enabled |
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|---------------------------------------|----------------------------|-------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|------------------|
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|**Sessions By State** (Preview) |sessions_by_state |Count |Overall state of the backends |State |No |
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|**Sessions By WaitEventType** (Preview)|sessions_by_wait_event_type |Count |Sessions by the type of event for which the backend is waiting |Wait Event Type|No |
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|**Oldest Backend** (Preview) |oldest_backend_time_sec |Seconds|The age in seconds of the oldest backend (irrespective of the state) |N/a |No |
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|**Oldest xmin** (Preview) |oldest_backend_xmin |Count |The actual value of the oldest xmin. If xmin is not increasing it indicates there are some long running transactions that can potentially hold dead tuples from being removed |N/a |No |
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|**Oldest xmin Age** (Preview) |oldest_backend_xmin_age |Count |Age in units of the oldest xmin. It indicated how many transactions passed since oldest xmin |N/a |No |
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##### `Database`
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##### Database
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|Display Name |Metric ID |Unit |Description |Dimension |Default enabled |
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|-------------------------------------|-------------|-----|----------------------------------------------------------------------------------------------------|-------------|------------------|
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|**Tuples Returned** (Preview) |tup_returned |Count|Number of rows returned by queries in this database |Database Name|No |
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|**Tuples Updated** (Preview) |tup_updated |Count|Number of rows updated by queries in this database |Database Name|No |
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##### `Logical Replication`
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##### Logical Replication
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|Display Name |Metric ID |Unit |Description |Dimension|Default enabled |
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|-------------------------------------|----------------------------------|-----|------------------------------------------------|---------|------------------|
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|**Max Logical Replication Lag** (Preview)|logical_replication_delay_in_bytes|Bytes|Maximum lag across all logical replication slots|N/a |Yes |
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##### `Replication`
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##### Replication
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|Display Name |Metric ID |Unit |Description |Dimension|Default enabled |
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|--------------------------------------|-------------------------------------|-------|--------------------------------------------------------------|---------|------------------|
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|**Max Physical Replication Lag** (Preview)|physical_replication_delay_in_bytes |Bytes |Maximum lag across all asynchronous physical replication slots|N/a |Yes |
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|**Read Replica Lag** (Preview) |physical_replication_delay_in_seconds|Seconds|Read Replica lag in seconds |N/a |Yes |
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##### `Saturation`
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##### Saturation
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|Display Name |Metric ID |Unit |Description |Dimension|Default enabled |
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|---------------------------------------|----------------------------------|-------|-----------------------------------------------------|---------|------------------|
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|**Disk Bandwidth Consumed Percentage**|disk_bandwidth_consumed_percentage|Percent|Percentage of data disk bandwidth consumed per minute|N/a |Yes |
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|**Disk IOPS Consumed Percentage** |disk_iops_consumed_percentage |Percent|Percentage of data disk I/Os consumed per minute |N/a |Yes |
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##### `Traffic`
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##### Traffic
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|Display Name|Metric ID |Unit |Description |Dimension|Default enabled |
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|-------------------|---------------|-----|---------------------------------------------------------------|---------|------------------|
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|**Max Connections^** |max_connections|Count|Max Connections |N/a |Yes |
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^ **Max Connections** here represents the configured value for _max_connections_ server parameter, and this metric is pooled every 30 minutes.
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## Autovacuum metrics
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Autovaccum metrics can be used to monitor and tune autovaccum performance for Azure database for postgres flexible server. Each metric is emitted at a **30 minute** frequency, and has up to **93 days** of retention. Customers can configure alerts on the metrics and can also access the new metrics dimensions, to split and filter the metrics data on database name.
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#### Enabling Autovacuum metrics
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* Autovacuum metrics are disabled by default
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* To enable these metrics, please turn ON the server parameter `metrics.autovacuum_diagnostics`.
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* This parameter is dynamic, hence will not require instance restart.
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#### Autovacuum metrics
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|Display Name |Metric ID |Unit |Description |Dimension |Default enabled|
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|-------------------------------------------------|-------------------------------|-----|--------------------------------------------------------------------------------------------------------|------------|---------------|
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|**Analyze Counter User Tables** (Preview) |analyze_count_user_tables |Count|Number of times user only tables have been manually analyzed in this database |DatabaseName|No |
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|**AutoAnalyze Counter User Tables** (Preview) |autoanalyze_count_user_tables |Count|Number of times user only tables have been analyzed by the autovacuum daemon in this database |DatabaseName|No |
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|**AutoVacuum Counter User Tables** (Preview) |autovacuum_count_user_tables |Count|Number of times user only tables have been vacuumed by the autovacuum daemon in this database |DatabaseName|No |
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|**Estimated Dead Rows User Tables** (Preview) |n_dead_tup_user_tables |Count|Estimated number of dead rows for user only tables in this database |DatabaseName|No |
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|**Estimated Live Rows User Tables** (Preview) |n_live_tup_user_tables |Count|Estimated number of live rows for user only tables in this database |DatabaseName|No |
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|**Estimated Modifications User Tables** (Preview)|n_mod_since_analyze_user_tables|Count|Estimated number of rows modified since user only tables were last analyzed |DatabaseName|No |
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|**User Tables Analyzed** (Preview) |tables_analyzed_user_tables |Count|Number of user only tables that have been analyzed in this database |DatabaseName|No |
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|**User Tables AutoAnalyzed** (Preview) |tables_autoanalyzed_user_tables|Count|Number of user only tables that have been analyzed by the autovacuum daemon in this database |DatabaseName|No |
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|**User Tables AutoVacuumed** (Preview) |tables_autovacuumed_user_tables|Count|Number of user only tables that have been vacuumed by the autovacuum daemon in this database |DatabaseName|No |
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|**User Tables Counter** (Preview) |tables_counter_user_tables |Count|Number of user only tables in this database |DatabaseName|No |
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|**User Tables Vacuumed** (Preview) |tables_vacuumed_user_tables |Count|Number of user only tables that have been vacuumed in this database |DatabaseName|No |
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|**Vacuum Counter User Tables** (Preview) |vacuum_count_user_tables |Count|Number of times user only tables have been manually vacuumed in this database (not counting VACUUM FULL)|DatabaseName|No |
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#### Applying Filters and Splitting on enhanced metrics
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#### Applying filters and splitting on metrics with dimension
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In the above list of metrics, some of the metrics have dimension such as `database name`, `state` etc. [Filtering](../../azure-monitor/essentials/metrics-charts.md#filters) and [Splitting](../../azure-monitor/essentials/metrics-charts.md#apply-splitting) are allowed for the metrics that have dimensions. These features show how various metric segments ("dimension values") affect the overall value of the metric. You can use them to identify possible outliers.
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