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includes/azure-monitor-limits-alerts.md

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| Alert rules and alert processing rules description length| Log search alerts 4,096 characters.<br/>All others are 2,048 characters. | Same as default. |
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### Alerts API
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Azure Monitor alerts have several throttling limits to protect against users making an excessive number of calls. Such behavior can potentially overload the system back-end resources and jeopardize service responsiveness. The following limits are designed to protect customers from interruptions and ensure a consistent service level. The user throttling and limits are designed to affect only extreme-usage scenarios. They shouldn't be relevant for typical usage.
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Azure Monitor alerts have several throttling limits to protect against users making an excessive number of calls. Such behavior can potentially overload the system back-end resources and jeopardize service responsiveness. The following limits are designed to protect customers from interruptions and ensure a consistent service level. The user throttling and limits are designed to affect only extreme usage scenarios. They shouldn't be relevant for typical usage.
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| Resource | Default limit | Maximum limit |
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| --- | --- | --- |

includes/azure-monitor-limits-log-queries.md

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| Log Analytics dashboard queries | Maximum number of records returned in a single Log Analytics dashboard query is 2,000. |
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### User query throttling
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Azure Monitor has several throttling limits to protect against users sending an excessive number of queries. Such behavior can potentially overload the system back-end resources and jeopardize service responsiveness. The following limits are designed to protect customers from interruptions and ensure consistent service level. The user throttling and limits are designed to affect only extreme-usage scenarios and shouldn't be relevant for typical usage.
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Azure Monitor has several throttling limits to protect against users sending an excessive number of queries. Such behavior can potentially overload the system back-end resources and jeopardize service responsiveness. The following limits are designed to protect customers from interruptions and ensure consistent service level. The user throttling and limits are designed to affect only extreme usage scenarios and shouldn't be relevant for typical usage.
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| Measure | Limit per user | Description |
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|:---|:---|:---|

includes/azure-monitor-limits-workspaces.md

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| Pricing tier | Limit per day | Data retention | Comment |
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|:---|:---|:---|:---|
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| [Pay-as-you-go](../articles/azure-monitor/logs/cost-logs.md#pricing-model)<br>(introduced April 2018) | No limit | Up to 730 days interactive retention /<br> up to 7 years [data archive](../articles/azure-monitor/logs/data-retention-archive.md) | Data retention beyond 31 days is available for extra charges. Learn more about [Azure Monitor pricing](https://azure.microsoft.com/pricing/details/monitor). |
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| [Commitment tiers](../articles/azure-monitor/logs/cost-logs.md#commitment-tiers)<br>(introduced November 2019) | No limit | Up to 730 days interactive retention /<br> up to 7 years [data archive](../articles/azure-monitor/logs/data-retention-archive.md) | Data retention beyond 31 days is available for extra charges. Learn more about [Azure Monitor pricing](https://azure.microsoft.com/pricing/details/monitor). |
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| [Pay-as-you-go](../articles/azure-monitor/logs/cost-logs.md#pricing-model)<br>(introduced April 2018) | No limit | Up to 730 days interactive retention/<br> up to 7 years [data archive](../articles/azure-monitor/logs/data-retention-archive.md) | Data retention beyond 31 days is available for extra charges. Learn more about [Azure Monitor pricing](https://azure.microsoft.com/pricing/details/monitor). |
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| [Commitment tiers](../articles/azure-monitor/logs/cost-logs.md#commitment-tiers)<br>(introduced November 2019) | No limit | Up to 730 days interactive retention/<br> up to 7 years [data archive](../articles/azure-monitor/logs/data-retention-archive.md) | Data retention beyond 31 days is available for extra charges. Learn more about [Azure Monitor pricing](https://azure.microsoft.com/pricing/details/monitor). |
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| [Legacy Per Node (OMS)](../articles/azure-monitor/logs/cost-logs.md#per-node-pricing-tier)<br>(introduced April 2016) | No limit | 30 to 730 days | Data retention beyond 31 days is available for extra charges. Learn more about [Azure Monitor pricing](https://azure.microsoft.com/pricing/details/monitor). Access to use tier is limited to subscriptions that contained a Log Analytics workspace or Application Insights resource on April 2, 2018, or are linked to an Enterprise Agreement that started before February 1, 2019 and is still active. |
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| [Legacy Standalone tier](../articles/azure-monitor/logs/cost-logs.md#standalone-pricing-tier)<br>(introduced April 2016) | No limit | 30 to 730 days | Data retention beyond 31 days is available for extra charges. Learn more about [Azure Monitor pricing](https://azure.microsoft.com/pricing/details/monitor). Access to use tier is limited to subscriptions that contained a Log Analytics workspace or Application Insights resource on April 2, 2018, or are linked to an Enterprise Agreement that started before February 1, 2019 and is still active.|
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| [Legacy Free tier](../articles/azure-monitor/logs/cost-logs.md#free-trial-pricing-tier)<br>(introduced April 2016) | 500 MB | 7 days | When your workspace reaches the 500-MB-per-day limit, data ingestion stops and resumes at the start of the next day. A day is based on UTC. Data collected by Microsoft Defender for Cloud isn't included in this 500-MB-per-day limit and continues to be collected above this limit. Creating new workspaces in, or moving existing workspaces into, the legacy Free Trial pricing tier is possible only until July 1, 2022. |
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<b id="data-ingestion-volume-rate">Data ingestion volume rate</b>
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Azure Monitor is a high-scale data service that serves thousands of customers sending terabytes of data each month at a growing pace. The volume rate limit intends to isolate Azure Monitor customers from sudden ingestion spikes in a multitenancy environment. A default ingestion volume rate threshold of 500 MB (compressed) is defined in workspaces. This rate is translated to approximately *6 GB/min* uncompressed. The actual size can vary between data types depending on the log length and its compression ratio.
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Azure Monitor is a high-scale data service that serves thousands of customers sending terabytes of data each month at a growing pace. The volume rate limit intends to isolate Azure Monitor customers from sudden ingestion spikes in a multitenancy environment. A default ingestion volume rate threshold of 500 MB (compressed) is defined in workspaces. This rate is translated to approximately 6 GB/min uncompressed. The actual size can vary between data types depending on the log length and its compression ratio.
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The volume rate limit applies to data ingested from Azure resources via [Diagnostic settings](../articles/azure-monitor/essentials/diagnostic-settings.md). When the volume rate limit is reached, a retry mechanism attempts to ingest the data four times in a period of 30 minutes and drop it if operation fails. It doesn't apply to data ingested from [agents](../articles/azure-monitor/agents/agents-overview.md) or the [Data Collector API](../articles/azure-monitor/logs/data-collector-api.md).
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When data sent to your workspace is at a volume rate higher than 80% of the threshold configured in your workspace, an event is sent to the *Operation* table in your workspace every 6 hours while the threshold continues to be exceeded.
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When data sent to your workspace is at a volume rate higher than 80% of the threshold configured in your workspace, an event is sent to the `Operation` table in your workspace every 6 hours while the threshold continues to be exceeded.
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When the ingested volume rate is higher than the threshold, some data is dropped. An event is sent to the *Operation* table in your workspace every 6 hours while the threshold continues to be exceeded. If your ingestion volume rate continues to exceed the threshold or you're expecting to reach it sometime soon, you can request to increase it by opening a support request.
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When the ingested volume rate is higher than the threshold, some data is dropped. An event is sent to the `Operation` table in your workspace every 6 hours while the threshold continues to be exceeded. If your ingestion volume rate continues to exceed the threshold or you're expecting to reach it sometime soon, you can request to increase it by opening a support request.
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See [Monitor health of Log Analytics workspace in Azure Monitor](../articles/azure-monitor/logs/monitor-workspace.md) to create alert rules to be proactively notified when you reach any ingestion limits.
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