fix: fluent-bit gce-startup.log filter & lua

Author: j5hjun

transition/terraform/dev/scripts/gce-startup.tpl

@@ -43,7 +43,13 @@ sudo tee /etc/td-agent-bit/td-agent-bit.conf > /dev/null <<EOF
 [FILTER]
   Name   grep
   Match  startup.log
-  Regex  message startup-script
+  Regex  log .*startup%-script.*
+
+[FILTER]
+  Name   lua
+  Match  startup.log
+  script /etc/td-agent-bit/trim_log.lua
+  call   trim
 
 [OUTPUT]
   Name cloudwatch_logs
@@ -70,6 +76,17 @@ sudo tee /etc/td-agent-bit/td-agent-bit.conf > /dev/null <<EOF
   auto_create_group true
 EOF
 
+sudo tee /etc/td-agent-bit/trim_log.lua > /dev/null <<'EOF'
+function trim(tag, timestamp, record)
+    local raw = record["log"]
+    local trimmed = string.match(raw, "startup%-script: (.*)")
+    if trimmed then
+        record["log"] = trimmed
+    end
+    return 1, timestamp, record
+end
+EOF
+
 sudo mkdir -p /etc/systemd/system/td-agent-bit.service.d
 sudo tee /etc/systemd/system/td-agent-bit.service.d/aws-creds.conf > /dev/null <<EOF
 [Service]