Fix docs

Author: ocelotl

docs/conf.py

@@ -178,3 +178,14 @@
     "scm_raw_web": (scm_raw_web + "/%s", "scm_raw_web"),
     "scm_web": (scm_web + "/%s", "scm_web"),
 }
+
+
+def on_missing_reference(app, env, node, contnode):
+    # FIXME Remove when opentelemetry.metrics._Gauge is renamed to
+    # opentelemetry.metrics.Gauge
+    if node["reftarget"] == "opentelemetry.metrics.Gauge":
+        return contnode
+
+
+def setup(app):
+    app.connect("missing-reference", on_missing_reference)

opentelemetry-sdk/src/opentelemetry/sdk/metrics/_internal/aggregation.py

@@ -1047,7 +1047,6 @@ class DefaultAggregation(Aggregation):
     `opentelemetry.sdk.metrics.ObservableCounter`        `SumAggregation`
     `opentelemetry.sdk.metrics.ObservableUpDownCounter`  `SumAggregation`
     `opentelemetry.sdk.metrics.Histogram`                `ExplicitBucketHistogramAggregation`
-    `opentelemetry.sdk.metrics._Gauge`                    `LastValueAggregation`
     `opentelemetry.sdk.metrics.ObservableGauge`          `LastValueAggregation`
     ==================================================== ====================================
     """