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diff --git a/app/assets/javascripts/performance/constants.js b/app/assets/javascripts/performance/constants.js
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+++ b/app/assets/javascripts/performance/constants.js
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+export const PERFORMANCE_TYPE_MARK = 'mark';
+export const PERFORMANCE_TYPE_MEASURE = 'measure';
+
+//
+// SNIPPET namespace
+//
+
+// Marks
+export const SNIPPET_MARK_VIEW_APP_START = 'snippet-view-app-start';
+export const SNIPPET_MARK_EDIT_APP_START = 'snippet-edit-app-start';
+export const SNIPPET_MARK_BLOBS_CONTENT = 'snippet-blobs-content-finished';
+
+// Measures
+export const SNIPPET_MEASURE_BLOBS_CONTENT = 'snippet-blobs-content';
+
+//
+// WebIDE namespace
+//
+
+// Marks
+export const WEBIDE_MARK_APP_START = 'webide-app-start';
+export const WEBIDE_MARK_TREE_START = 'webide-tree-start';
+export const WEBIDE_MARK_TREE_FINISH = 'webide-tree-finished';
+export const WEBIDE_MARK_FILE_START = 'webide-file-start';
+export const WEBIDE_MARK_FILE_CLICKED = 'webide-file-clicked';
+export const WEBIDE_MARK_FILE_FINISH = 'webide-file-finished';
+
+// Measures
+export const WEBIDE_MEASURE_TREE_FROM_REQUEST = 'webide-tree-loading-from-request';
+export const WEBIDE_MEASURE_FILE_FROM_REQUEST = 'webide-file-loading-from-request';
+export const WEBIDE_MEASURE_FILE_AFTER_INTERACTION = 'webide-file-loading-after-interaction';
+
+//
+// MR Diffs namespace
+
+// Marks
+export const MR_DIFFS_MARK_FILE_TREE_START = 'mr-diffs-mark-file-tree-start';
+export const MR_DIFFS_MARK_FILE_TREE_END = 'mr-diffs-mark-file-tree-end';
+export const MR_DIFFS_MARK_DIFF_FILES_START = 'mr-diffs-mark-diff-files-start';
+export const MR_DIFFS_MARK_FIRST_DIFF_FILE_SHOWN = 'mr-diffs-mark-first-diff-file-shown';
+export const MR_DIFFS_MARK_DIFF_FILES_END = 'mr-diffs-mark-diff-files-end';
+
+// Measures
+export const MR_DIFFS_MEASURE_FILE_TREE_DONE = 'mr-diffs-measure-file-tree-done';
+export const MR_DIFFS_MEASURE_DIFF_FILES_DONE = 'mr-diffs-measure-diff-files-done';