diff --git a/api/src/org/labkey/api/qc/TsvDataSerializer.java b/api/src/org/labkey/api/qc/TsvDataSerializer.java
index 391d3aaa376..839ef801867 100644
--- a/api/src/org/labkey/api/qc/TsvDataSerializer.java
+++ b/api/src/org/labkey/api/qc/TsvDataSerializer.java
@@ -91,8 +91,8 @@ private List<String> exportData(DataIteratorBuilder data, List<String> columns,
                         sep = "\t";
                     }
                     pw.println();
-                    writeRow(row, columns, pw, tsvWriter);
                 }
+                writeRow(row, columns, pw, tsvWriter); // GitHub Issue #875: write the first row regardless of whether we had a header or not
 
                 // write the remaining rows
                 while (iter.next())
diff --git a/experiment/src/org/labkey/experiment/ExperimentModule.java b/experiment/src/org/labkey/experiment/ExperimentModule.java
index 90312720f61..589473bb821 100644
--- a/experiment/src/org/labkey/experiment/ExperimentModule.java
+++ b/experiment/src/org/labkey/experiment/ExperimentModule.java
@@ -652,6 +652,17 @@ SELECT COUNT(DISTINCT DD.DomainURI) FROM
                                  JOIN exp.DomainDescriptor DD on PD.domainID = DD.domainId
                         WHERE DD.domainUri LIKE ? AND D.rangeURI = ?""", "urn:lsid:%:" + ExpProtocol.AssayDomainTypes.Result.getPrefix() + ".%", PropertyType.FILE_LINK.getTypeUri()).getObject(Long.class));
 
+                    // metric to count the number of Luminex and Standard assay runs that were imported with > 1 data file
+                    assayMetrics.put("assayRunsWithMultipleInputFiles", new SqlSelector(schema, """
+                        SELECT COUNT(*) FROM (
+                            SELECT sourceapplicationid, COUNT(*) AS count FROM exp.data
+                            WHERE name NOT LIKE '%.log' AND name NOT LIKE '%.Rout' AND name NOT LIKE '%.pdf' AND sourceapplicationid IN (
+                                SELECT rowid FROM exp.protocolapplication
+                                WHERE lsid LIKE '%:SimpleProtocol.CoreStep' AND (protocollsid LIKE '%:LuminexAssayProtocol.%' OR protocollsid LIKE '%:GeneralAssayProtocol.%')
+                            )
+                            GROUP BY sourceapplicationid
+                        ) x WHERE count > 1""").getObject(Long.class));
+
                     Map<String, Object> sampleLookupCountMetrics = new HashMap<>();
                     SQLFragment baseAssaySampleLookupSQL = new SQLFragment("SELECT COUNT(*) FROM exp.propertydescriptor WHERE (lookupschema = 'samples' OR (lookupschema = 'exp' AND lookupquery =  'Materials')) AND propertyuri LIKE ?");