Page related updates to synthetics (#1796)

Co-authored-by: ci.datadog-api-spec <packages@datadoghq.com>

Author: api-clients-generation-pipeline[bot]

.generator/schemas/v1/openapi.yaml

@@ -11815,7 +11815,8 @@ components:
         The default option results in different behavior depending on the monitor query type.
         For monitors using Count queries, an empty monitor evaluation is treated as 0 and is compared to the threshold conditions.
         For monitors using any query type other than Count, for example Gauge, Measure, or Rate, the monitor shows the last known status.
-        This option is only available for APM Trace Analytics, Audit Trail, CI, Error Tracking, Event, Logs, and RUM monitors.
+        This option is available for APM Trace Analytics, Audit Trail, CI, Error Tracking, Event, Logs, and RUM monitors.
+        It is also required for metric monitors that use `scheduling_options.custom_schedule`.
       enum:
         - "default"
         - "show_no_data"

src/datadogV1/model/model_monitor_options.rs

@@ -130,7 +130,8 @@ pub struct MonitorOptions {
     /// The default option results in different behavior depending on the monitor query type.
     /// For monitors using Count queries, an empty monitor evaluation is treated as 0 and is compared to the threshold conditions.
     /// For monitors using any query type other than Count, for example Gauge, Measure, or Rate, the monitor shows the last known status.
-    /// This option is only available for APM Trace Analytics, Audit Trail, CI, Error Tracking, Event, Logs, and RUM monitors.
+    /// This option is available for APM Trace Analytics, Audit Trail, CI, Error Tracking, Event, Logs, and RUM monitors.
+    /// It is also required for metric monitors that use `scheduling_options.custom_schedule`.
     #[serde(rename = "on_missing_data")]
     pub on_missing_data: Option<crate::datadogV1::model::OnMissingDataOption>,
     /// The number of minutes after the last notification before a monitor re-notifies on the current status.