-If you select Event Hubs or a Storage account, you can specify a retention policy. This policy deletes data that is older than a selected time period. If you specify Log Analytics, the retention policy depends on the selected pricing tier. Logs ingested into your **Log Analytics** workspace can be retained at no charge for up to first 31 days. Logs retained beyond these no-charge periods will be charged for each GB of data retained for a month (pro-rated daily). For more details, refer[Azure Monitor pricing](https://azure.microsoft.com/en-gb/pricing/details/monitor/).
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