Deprecate FairRunAnaProof::Instance()

To get rid of some of the singleton-like behaviour, start to deprecate it.
FairRootGroup · Nov 11, 2022 · 29b7cbf · 29b7cbf
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -38,6 +38,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
     * It will be disabled by default in FairRoot 19.
     * We plan to remove it completely in FairRoot 20.
   * If you need it, speak up NOW.
+* Deprecate some singleton-like APIs:
+  * `FairRunAnaProof::Instance()` - keep a pointer to the
+    object after `new` in your code.
 
 ### Other Notable Changes
 * Tests using Geant3 have been disabled by default, because

diff --git a/base/steer/FairRunAnaProof.h b/base/steer/FairRunAnaProof.h
@@ -24,7 +24,7 @@
 class FairRunAnaProof : public FairRunAna
 {
   public:
-    static FairRunAnaProof* Instance();
+    [[deprecated]] static FairRunAnaProof* Instance();   ///< \deprecated
     virtual ~FairRunAnaProof();
     FairRunAnaProof(const char* proofName = "");