momo-jun commented on code in PR #16722:
URL: https://github.com/apache/pulsar/pull/16722#discussion_r927332792


##########
site2/docs/reference-metrics.md:
##########
@@ -435,6 +435,15 @@ All the subscription metrics are labelled with the 
following labels:
 | pulsar_subscription_msg_rate_out | Gauge | The total message dispatch rate 
for a subscription (message per second). |
 | pulsar_subscription_msg_throughput_out | Gauge | The total message dispatch 
throughput for a subscription (byte per second). |
 | pulsar_subscription_msg_ack_rate | Gauge | The total message acknowledgment 
rate for a subscription (message per second). |
+| pulsar_subscription_last_expire_timestamp | Gauge | The subscription last 
message expire execution timestamp. |
+| pulsar_subscription_last_acked_timestamp | Gauge | The subscription last 
acked message timestamp. |
+| pulsar_subscription_last_consumed_flow_timestamp | Gauge | The subscription 
last received consume flow command timestamp. |

Review Comment:
   ```suggestion
   | pulsar_subscription_last_consumed_flow_timestamp | Gauge | The timestamp 
of the last received consume flow command on the subscription. |
   ```



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