feat(metrics): Add an option to extrapolate tx and span metrics

src/sentry/options/defaults.py

@@ -1466,6 +1466,18 @@
     flags=FLAG_AUTOMATOR_MODIFIABLE,
 )
 
+register(
+    "sentry-metrics.extrapolation.enable_transactions",
+    default=False,
+    flags=FLAG_AUTOMATOR_MODIFIABLE,
+)
+
+register(
+    "sentry-metrics.extrapolation.enable_spans",
+    default=False,
+    flags=FLAG_AUTOMATOR_MODIFIABLE,
+)
+
 # Performance issue option for *all* performance issues detection
 register("performance.issues.all.problem-detection", default=1.0, flags=FLAG_AUTOMATOR_MODIFIABLE)
 

src/sentry/relay/config/metric_extraction.py

@@ -149,10 +149,24 @@ def get_extrapolation_config(project: Project) -> MetricExtrapolationConfig | No
     # Extrapolation applies to extracted metrics. This enables extrapolation for
     # the entire `custom` namespace, but this does not extrapolate old custom
     # metrics sent from the SDK directly.
-    return {
+    config = {
         "include": ["?:custom/*"],
+        "exclude": [],
     }
 
+    if options.get("sentry-metrics.extrapolation.enable_transactions"):
+        config["include"] += ["?:transactions/*"]
+        config["exclude"] += [
+            "c:transactions/usage@none",
+            "c:transactions/count_per_root_project@none",
+        ]
+
+    if options.get("sentry-metrics.extrapolation.enable_spans"):
+        config["include"] += ["?:spans/*"]
+        config["exclude"] += ["c:spans/usage@none"]
+
+    return config
+
 
 def get_on_demand_metric_specs(
     timeout: TimeChecker, project: Project