updated transaction_isolation check using ./util/update-modules

bin/pt-mysql-summary

@@ -2095,6 +2095,17 @@ section_innodb () {
    local bp_free="$(get_var Innodb_buffer_pool_pages_free "$status_file")"
    local bp_dirt="$(get_var Innodb_buffer_pool_pages_dirty "$status_file")"
    local bp_fill=$((${bp_pags} - ${bp_free}))
+
+   local mysql_version=$(get_var version "$variables_file" | awk -F'-' '{print $1}')
+   local transaction_isolation_var="tx_isolation"
+   version_greater_equal() { # Function to compare versions
+      [ "$(printf '%s\n' "$1" "$2" | sort -V | head -n1)" = "$2" ]
+   }
+   if version_greater_equal "$mysql_version" "5.7.20"; then # true if version >= 5.7.20
+         transaction_isolation_var="transaction_isolation"
+   fi
+
+
    name_val "Buffer Pool Fill"   "$(fuzzy_pct ${bp_fill} ${bp_pags})"
    name_val "Buffer Pool Dirty"  "$(fuzzy_pct ${bp_dirt} ${bp_pags})"
 
@@ -2129,7 +2140,7 @@ section_innodb () {
    name_val "Commit Concurrency"  \
             "$(get_var innodb_commit_concurrency "$variables_file")"
    name_val "Txn Isolation Level" \
-            "$(get_var transaction_isolation "$variables_file")"
+            "$(get_var $transaction_isolation_var "$variables_file")"
    name_val "Adaptive Flushing"   \
             "$(get_var innodb_adaptive_flushing "$variables_file")"
    name_val "Adaptive Checkpoint" \