sumologicexporter: do not replace . with _ for prometheus format (#…

…32595)

**Description:**

Use new formatter for prometheus, which fixes metric name sanitization.
This also refactors the formatter itself, which is part of #31479 and
reduces size of #32315

**Link to tracking Issue:**

Applies SumoLogic/sumologic-otel-collector#211
and more, but this one is a bug fix

**Testing:**

Unit tests

**Documentation:**

N/A

---------

Signed-off-by: Dominik Rosiek <drosiek@sumologic.com>

.chloggen/drosiek-sumologicexporter-prom-formatter.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# 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: sumologicexporter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "do not replace `.` with `_` for prometheus format"
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [31479]
+
+# (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:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

exporter/sumologicexporter/exporter_test.go

@@ -231,7 +231,7 @@ func TestAllMetricsSuccess(t *testing.T) {
 	test := prepareSenderTest(t, []func(w http.ResponseWriter, req *http.Request){
 		func(_ http.ResponseWriter, req *http.Request) {
 			body := extractBody(t, req)
-			expected := `test_metric_data{test="test_value",test2="second_value"} 14500 1605534165000
+			expected := `test.metric.data{test="test_value",test2="second_value"} 14500 1605534165000
 gauge_metric_name{foo="bar",remote_name="156920",url="http://example_url"} 124 1608124661166
 gauge_metric_name{foo="bar",remote_name="156955",url="http://another_url"} 245 1608124662166`
 			assert.Equal(t, expected, body)
@@ -256,7 +256,7 @@ func TestAllMetricsFailed(t *testing.T) {
 			w.WriteHeader(500)
 
 			body := extractBody(t, req)
-			expected := `test_metric_data{test="test_value",test2="second_value"} 14500 1605534165000
+			expected := `test.metric.data{test="test_value",test2="second_value"} 14500 1605534165000
 gauge_metric_name{foo="bar",remote_name="156920",url="http://example_url"} 124 1608124661166
 gauge_metric_name{foo="bar",remote_name="156955",url="http://another_url"} 245 1608124662166`
 			assert.Equal(t, expected, body)
@@ -285,7 +285,7 @@ func TestMetricsPartiallyFailed(t *testing.T) {
 			w.WriteHeader(500)
 
 			body := extractBody(t, req)
-			expected := `test_metric_data{test="test_value",test2="second_value"} 14500 1605534165000`
+			expected := `test.metric.data{test="test_value",test2="second_value"} 14500 1605534165000`
 			assert.Equal(t, expected, body)
 			assert.Equal(t, "application/vnd.sumologic.prometheus", req.Header.Get("Content-Type"))
 		},
@@ -343,7 +343,7 @@ func TestMetricsDifferentMetadata(t *testing.T) {
 			w.WriteHeader(500)
 
 			body := extractBody(t, req)
-			expected := `test_metric_data{test="test_value",test2="second_value",key1="value1"} 14500 1605534165000`
+			expected := `test.metric.data{test="test_value",test2="second_value",key1="value1"} 14500 1605534165000`
 			assert.Equal(t, expected, body)
 			assert.Equal(t, "application/vnd.sumologic.prometheus", req.Header.Get("Content-Type"))
 		},