Add error message to span error status description. Closes #167

Author: duncanpo

auto-instrumentation/+opentelemetry/+autoinstrument/AutoTrace.m

@@ -150,7 +150,7 @@ function handleError(obj, ME)
             %    spans and their corresponding scopes. Rethrow the
             %    exception ME.
             if ~isempty(obj.Instrumentor.Spans)
-                setStatus(obj.Instrumentor.Spans(end), "Error");
+                setStatus(obj.Instrumentor.Spans(end), "Error", ME.message);
                 for i = length(obj.Instrumentor.Spans):-1:1
                     obj.Instrumentor.Spans(i) = [];
                     obj.Instrumentor.Scopes(i) = [];
@@ -195,4 +195,4 @@ function handleError(obj, ME)
     % file
     f = processFileInput(f);
 end
-end
+end

test/tautotrace.m

@@ -253,6 +253,8 @@ function testError(testCase)
 
             % check error status
             verifyEqual(testCase, results{1}.resourceSpans.scopeSpans.spans.status.code, 2);  % error 
+            verifyEqual(testCase, results{1}.resourceSpans.scopeSpans.spans.status.message, ...
+                'Input must be a numeric scalar');  
             verifyEmpty(testCase, fieldnames(results{2}.resourceSpans.scopeSpans.spans.status));  % ok, no error
         end
 
@@ -287,6 +289,8 @@ function testHandleError(testCase)
 
             % check error status
             verifyEqual(testCase, results{1}.resourceSpans.scopeSpans.spans.status.code, 2);  % error
+            verifyEqual(testCase, results{1}.resourceSpans.scopeSpans.spans.status.message, ...
+                'Input must be a numeric scalar');  
             verifyEmpty(testCase, fieldnames(results{2}.resourceSpans.scopeSpans.spans.status));  % ok, no error
         end