title: pg_wal directory is full in postgres db
body: <p>I have postgres 10 where pg_wal is getting full. I have files pg_wal directory from Dec'2020. I have enabled &quot;archive&quot; but I was getting archiver error and my application stopped working. Since this issue is on Production, I have disabled the archive.</p>
  <p>Is it safe to remove old files from pg_wal which is dated on Dec'2020 and Jan'2021?</p>
  <p>I can see this:</p>
  <pre><code>postgres=# SELECT * FROM pg_replication_slots;
  
   slot_name | plugin | slot_type | datoid | database | temporary | active | active_pid | xmin | catalog_xmin | restart_lsn  | c onfirmed_flush_lsn
  -----------+--------+-----------+--------+----------+-----------+--------+------------+------+--------------+--------------+---------------------
    m9t0179g |        |  physical |        |          |         f |      f |            |      |              |   50/B780000 |
         m9t |        |  physical |        |          |         f |      f |            |      |              | 3B0/EB000920 | 
  </code></pre>