diff --git a/collector/fixtures/e2e-output.txt b/collector/fixtures/e2e-output.txt
index 97c899ac..d377115f 100644
--- a/collector/fixtures/e2e-output.txt
+++ b/collector/fixtures/e2e-output.txt
@@ -319,6 +319,16 @@ node_cpu_info{cachesize="8192 KB",core="2",cpu="2",family="6",microcode="0xb4",m
 node_cpu_info{cachesize="8192 KB",core="2",cpu="6",family="6",microcode="0xb4",model="142",model_name="Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz",package="0",stepping="10",vendor="GenuineIntel"} 1
 node_cpu_info{cachesize="8192 KB",core="3",cpu="3",family="6",microcode="0xb4",model="142",model_name="Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz",package="0",stepping="10",vendor="GenuineIntel"} 1
 node_cpu_info{cachesize="8192 KB",core="3",cpu="7",family="6",microcode="0xb4",model="142",model_name="Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz",package="0",stepping="10",vendor="GenuineIntel"} 1
+# HELP node_cpu_isolated Whether each core is isolated, information from /sys/devices/system/cpu/isolated.
+# TYPE node_cpu_isolated gauge
+node_cpu_isolated{cpu="0"} 0
+node_cpu_isolated{cpu="1"} 1
+node_cpu_isolated{cpu="2"} 0
+node_cpu_isolated{cpu="3"} 1
+node_cpu_isolated{cpu="4"} 1
+node_cpu_isolated{cpu="5"} 1
+node_cpu_isolated{cpu="6"} 0
+node_cpu_isolated{cpu="7"} 0
 # HELP node_cpu_package_throttles_total Number of times this CPU package has been throttled.
 # TYPE node_cpu_package_throttles_total counter
 node_cpu_package_throttles_total{package="0"} 30
diff --git a/collector/fixtures/sys.ttar b/collector/fixtures/sys.ttar
index 72a97b41..b837f3dd 100644
--- a/collector/fixtures/sys.ttar
+++ b/collector/fixtures/sys.ttar
@@ -3540,6 +3540,11 @@ Lines: 1
 1
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: sys/devices/system/cpu/isolated
+Lines: 1
+1,3-5,9
+Mode: 664
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Directory: sys/devices/system/edac
 Mode: 755
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -