Update usage-estimated-costs.md

Author: bwren

articles/azure-monitor/usage-estimated-costs.md

@@ -24,7 +24,7 @@ Several other features don't have a direct cost, but instead you pay for the ing
 | Logs | Ingestion, retention, and export of data in Log Analytics workspaces and legacy Application Insights resources. For most customers, this category typically incurs the bulk of Azure Monitor charges. There's no charge for querying this data except in the case of [Basic Logs](logs/basic-logs-configure.md) or [Archived Logs](logs/data-retention-archive.md).<br><br>Charges for logs can vary significantly on the configuration that you choose. For information on how charges for logs data are calculated and the different pricing tiers available, see [Azure Monitor logs pricing details](logs/cost-logs.md). |
 | Platform logs | Processing of [diagnostic and auditing information](essentials/resource-logs.md) is charged for [certain services](essentials/resource-logs-categories.md#costs) when sent to destinations other than a Log Analytics workspace. There's no direct charge when this data is sent to a Log Analytics workspace, but there's a charge for the workspace data ingestion and collection. |
 | Metrics | There's no charge for [standard metrics](essentials/metrics-supported.md) collected from Azure resources. There's a cost for collecting [custom metrics](essentials/metrics-custom-overview.md) and for retrieving metrics from the [REST API](essentials/rest-api-walkthrough.md#retrieve-metric-values). |
-| Prometheus Metrics | The service is currently free to use, with billing set to begin on 8/1/2023. Pricing for [Azure Monitor managed service for Prometheus](essentials/prometheus-metrics-overview.md) is based on [data samples ingested](essentials/prometheus-metrics-enable.md)  and [query samples processed](essentials/azure-monitor-workspace-manage.md#link-a-grafana-workspace). Data is retained for 18 months at no extra charge. |
+| Prometheus Metrics | Pricing for [Azure Monitor managed service for Prometheus](essentials/prometheus-metrics-overview.md) is based on [data samples ingested](essentials/prometheus-metrics-enable.md)  and [query samples processed](essentials/azure-monitor-workspace-manage.md#link-a-grafana-workspace). Data is retained for 18 months at no extra charge. |
 | Alerts | Charges are based on the type and number of signals used by the alert rule, its frequency, and the type of [notification](alerts/action-groups.md) used in response. For [Log alerts](alerts/alerts-types.md#log-alerts) configured for [at-scale monitoring](alerts/alerts-types.md#splitting-by-dimensions-in-log-alert-rules), the cost also depends on the number of time series created by the dimensions resulting from your query. |
 | Web tests | There's a cost for [standard web tests](app/availability-standard-tests.md) and [multistep web tests](/previous-versions/azure/azure-monitor/app/availability-multistep) in Application Insights. Multistep web tests have been deprecated.