From 33f2819b429d21835291f63e4e005398232aedf8 Mon Sep 17 00:00:00 2001
From: Valeriy Khakhutskyy <1292899+valeriy42@users.noreply.github.com>
Date: Tue, 21 Jul 2026 16:57:29 +0200
Subject: [PATCH 1/2] [ML] Downgrade redundant CStateDecompressor empty-state
 log to INFO

The LOG_ERROR at readHeader() for missing or empty compressed state
documents was never addressed in #2895 and is redundant with parseNext()
diagnostics. Downgrade to INFO so routine categorizer state restore
misses no longer trip the serverless ERROR log-rate promotion gate.

Relates #2875
---
 docs/CHANGELOG.asciidoc        | 1 +
 lib/core/CStateDecompressor.cc | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/docs/CHANGELOG.asciidoc b/docs/CHANGELOG.asciidoc
index e66c892e42..0b50895411 100644
--- a/docs/CHANGELOG.asciidoc
+++ b/docs/CHANGELOG.asciidoc
@@ -38,6 +38,7 @@
 
 * Harden pytorch_inference with TorchScript model graph validation. (See {ml-pull}3008[#3008].)
 * Better handling of invalid JSON state documents (See {ml-pull}[]#2895].)
+* Downgrade redundant "Failed to find valid JSON" log in `CStateDecompressor` from ERROR to INFO for empty or missing state documents (See {ml-issue}2875[#2875].)
 * Better error handling regarding quantiles state documents (See {ml-pull}[#2894])
 
 == {es} version 9.3.0
diff --git a/lib/core/CStateDecompressor.cc b/lib/core/CStateDecompressor.cc
index 2d1f926551..acea58898e 100644
--- a/lib/core/CStateDecompressor.cc
+++ b/lib/core/CStateDecompressor.cc
@@ -149,7 +149,7 @@ bool CStateDecompressor::CDechunkFilter::parseNext() {
 
 bool CStateDecompressor::CDechunkFilter::readHeader() {
     if (this->parseNext() == false) {
-        LOG_ERROR(<< "Failed to find valid JSON");
+        LOG_INFO(<< "No valid JSON found in compressed state stream (empty or missing state document)");
         m_Initialised = false;
         m_IStream.reset();
         ++m_CurrentDocNum;

From 8ab30a8266ca76d9f07c44dcb5f20aed5324adc4 Mon Sep 17 00:00:00 2001
From: Valeriy Khakhutskyy <1292899+valeriy42@users.noreply.github.com>
Date: Tue, 21 Jul 2026 20:31:23 +0200
Subject: [PATCH 2/2] Update CHANGELOG.asciidoc

---
 docs/CHANGELOG.asciidoc | 1 -
 1 file changed, 1 deletion(-)

diff --git a/docs/CHANGELOG.asciidoc b/docs/CHANGELOG.asciidoc
index 0b50895411..e66c892e42 100644
--- a/docs/CHANGELOG.asciidoc
+++ b/docs/CHANGELOG.asciidoc
@@ -38,7 +38,6 @@
 
 * Harden pytorch_inference with TorchScript model graph validation. (See {ml-pull}3008[#3008].)
 * Better handling of invalid JSON state documents (See {ml-pull}[]#2895].)
-* Downgrade redundant "Failed to find valid JSON" log in `CStateDecompressor` from ERROR to INFO for empty or missing state documents (See {ml-issue}2875[#2875].)
 * Better error handling regarding quantiles state documents (See {ml-pull}[#2894])
 
 == {es} version 9.3.0