fix: Update Jenkins Fluent-bit for capture hostname. (#92)

Update to observe-jenkins.conf to capture hostname for Jenkins installation.

Author: obs-gh-justindaines

config_files/observe-jenkins.conf

@@ -28,6 +28,13 @@
     Match jenkins*
     call append_tag
     code function append_tag(tag, timestamp, record) new_record = record new_record["_tag"] = tag return 1, timestamp, new_record end
+[FILTER]
+    Name record_modifier
+    Match *
+    Record host ${HOSTNAME}
+    Record datacenter REPLACE_WITH_DATACENTER
+    Record obs_ver 20230412
+    Remove_key _MACHINE_ID
 [OUTPUT]
     name        http
     match       jenkins*