Addings doc update for OCPBUGS-29024

Author: aireilly

modules/nw-ptp-operator-metrics-reference.adoc

@@ -22,7 +22,7 @@ Some of the following metrics are applicable for PTP grandmaster clocks (T-GM) o
 
 |`openshift_ptp_clock_class`
 |Returns the PTP clock class for the interface.
-Possible values for PTP clock class are 6 (`LOCKED`), 7 (`PRC UNLOCKED IN-SPEC`), 52 (`PRC UNLOCKED OUT-OF-SPEC`), 187 (`PRC UNLOCKED OUT-OF-SPEC`), 248 (`DEFAULT`), or 255 (`SLAVE ONLY CLOCK`).
+Possible values for PTP clock class are 6 (`LOCKED`), 7 (`PRC UNLOCKED IN-SPEC`), 52 (`PRC UNLOCKED OUT-OF-SPEC`), 187 (`PRC UNLOCKED OUT-OF-SPEC`), 135 (`T-BC HOLDOVER IN-SPEC`), 165 (`T-BC HOLDOVER OUT-OF-SPEC`), 248 (`DEFAULT`), or 255 (`SLAVE ONLY CLOCK`).
 Applicable to T-GM clocks only.
 |`{node="compute-1.example.com",process="ptp4l"} 6`