Update packages/google-cloud-bigtable/google/cloud/bigtable/data/_metrics/handlers/gcp_exporter.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: daniel-sanche

packages/google-cloud-bigtable/google/cloud/bigtable/data/_metrics/handlers/gcp_exporter.py

@@ -179,7 +179,7 @@ def export(
                                 metric=GMetric(
                                     type=f"{self.prefix}/{metric.name}",
                                     labels={
-                                        k: v
+                                        k: str(v)
                                         for k, v in data_point.attributes.items()
                                         if not k.startswith("resource_")
                                     },