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doc: added autovacuum metrics description
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Diff for: documentation/metrics.md

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- **Autovacuum Utilization (instant)**
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<table>
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<tr>
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<th>Name</th>
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<td>PostgreSQL Autovacuum: Utilization per [MAMONSU_INTERVAL] seconds</td>
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</tr>
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<tr>
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<th>Key</th>
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<td>pgsql.autovacumm.utilization[]</td>
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</tr>
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<tr>
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<th>Type</th>
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<td>Numeric (float)</td>
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</tr>
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<tr>
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<th>Units</th>
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<td></td>
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</tr>
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<tr>
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<th>Delta</th>
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<td>As Is</td>
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</tr>
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<tr>
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<th>Supported Version</th>
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<td>9.5+</td>
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</tr>
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</table>
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- **Autovacuum Utilization (average per 5 minutes)**
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<table>
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<tr>
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<th>Name</th>
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<td>PostgreSQL Autovacuum: Utilization per 5 minutes</td>
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</tr>
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<tr>
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<th>Key</th>
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<td>pgsql.autovacumm.utilization.avg5[]</td>
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</tr>
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<tr>
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<th>Type</th>
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<td>Numeric (float)</td>
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</tr>
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<tr>
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<th>Units</th>
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<td></td>
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</tr>
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<tr>
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<th>Delta</th>
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<td>As Is</td>
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</tr>
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<tr>
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<th>Supported Version</th>
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<td>9.5+</td>
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</tr>
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</table>
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- **Autovacuum Utilization (average per 15 minutes)**
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<table>
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<tr>
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<th>Name</th>
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<td>PostgreSQL Autovacuum: Utilization per 15 minutes</td>
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</tr>
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<tr>
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<th>Key</th>
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<td>pgsql.autovacumm.utilization.avg15[]</td>
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</tr>
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<tr>
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<th>Type</th>
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<td>Numeric (float)</td>
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</tr>
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<tr>
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<th>Units</th>
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<td></td>
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</tr>
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<tr>
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<th>Delta</th>
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<td>As Is</td>
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</tr>
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<tr>
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<th>Supported Version</th>
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<td>9.5+</td>
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</tr>
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</table>
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- **Autovacuum Utilization (average per 30 minutes)**
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<table>
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<tr>
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<th>Name</th>
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<td>PostgreSQL Autovacuum: Utilization per 30 minutes</td>
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</tr>
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<tr>
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<th>Key</th>
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<td>pgsql.autovacumm.utilization.avg30[]</td>
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</tr>
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<tr>
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<th>Type</th>
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<td>Numeric (float)</td>
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</tr>
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<tr>
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<th>Units</th>
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<td></td>
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</tr>
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<tr>
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<th>Delta</th>
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<td>As Is</td>
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</tr>
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<tr>
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<th>Supported Version</th>
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<td>9.5+</td>
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</tr>
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</table>
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*Autovacuum Workers* evaluates as count of `pg_stat_activity.backend_type = 'autovacuum worker'` for PG 10+ and as summa of avtovacuum queries with not idle state for PG 9.6 and lower.
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## Background Writer

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