[receiver/googlecloudspannerreceiver] Fix spanner receiver.

.chloggen/fix-spanner.yaml

@@ -0,0 +1,16 @@
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: receiver/googlecloudspannerreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Changed the type of the used_bytes metric from int to float
+
+# One or more tracking issues related to the change
+issues: []
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:

receiver/googlecloudspannerreceiver/internal/metadataconfig/metadata.yaml

@@ -534,7 +534,7 @@ metadata:
     metrics:
       - name: "used_bytes"
         column_name: "USED_BYTES"
-        value_type: "int"
+        value_type: "float"
         data:
           type: "gauge"
         unit: "byte"