[perforator] Document LBR requirement for sPGO

commit_hash:818f9b353d64cfc984865ec4a14e84d1136e1ad9
yandex · Feb 1, 2025 · 9943dee · 9943dee
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diff --git a/docs/en/guides/autofdo.md b/docs/en/guides/autofdo.md
@@ -11,6 +11,7 @@ Perforator supports generating sPGO (sampling Profile-guided optimization) profi
 
 * Intel CPU
 * Linux Kernel >=5.7
+* LBR (Last Branch Records) available for reading. Many cloud providers disable LBR by default.
 
 ## Acquiring the sPGO profile