Timing out A Blocker Based on Time or Count of Waiters

[Fred Habash <fmhabash@xxxxxxxxx>]

Facing an issue where sometimes humans login to a database and run DDL statements causing a long locking tree of over 1000 waiters. As a workaround, we asked developers to always start their DDL sessions with 'SET lock_timeout = 'Xs'. 

I reviewed the native lock timeout parameter in Postgres and found 7. None seem to be related to blocker timeouts directly.

idle_in_transaction_session_timeout
idle_session_timeout
lock_timeout: How long a session waits for a lock
statement_timeout
authentication_timeout
deadlock_timeout
log_lock_waits

Instead, I put together a quick procedure that counts waiter sessions for a given blocker and terminates it if waiter count exceeds a threshold.

Is there not a native way to ...

1. Automatically time out a blocker

2. A metric that shows how many waiters for a blocker?

Thanks

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Thank you