Parse Log Errors

We had intermittent 502s between 2-4 AM. Can you tell me what happened from these logs?

---------- Forwarded message ----------
On Tuesday, March 10, 2026, Jordan Pace jordan.pace@cedarlinehosting.com wrote:

Pulled these from the last two hours of the incident window:

[2026-03-10 02:14:33] nginx: upstream timed out (110: Connection timed out) while reading response header from upstream, client: 10.0.3.47, server: app.cedarline.io, upstream: http://10.0.2.15:8080/api/users
[2026-03-10 02:14:33] nginx: upstream timed out (110: Connection timed out) while reading response header from upstream, client: 10.0.3.51, server: app.cedarline.io, upstream: http://10.0.2.15:8080/api/orders
[2026-03-10 02:15:01] app-server: WARN pool-exhaustion: active_connections=150 max_pool=150 wait_queue=23
[2026-03-10 02:15:01] app-server: ERROR timeout acquiring connection from pool after 30000ms
[2026-03-10 02:15:02] app-server: ERROR timeout acquiring connection from pool after 30000ms
[2026-03-10 02:15:14] postgres: LOG duration: 45231.442 ms statement: SELECT o.*, u.email FROM orders o JOIN users u ON o.user_id = u.id WHERE o.status = 'pending' AND o.created_at > '2026-03-09'
[2026-03-10 02:15:18] app-server: WARN pool-exhaustion: active_connections=150 max_pool=150 wait_queue=31
[2026-03-10 02:16:44] postgres: LOG duration: 52108.331 ms statement: SELECT o.*, u.email FROM orders o JOIN users u ON o.user_id = u.id WHERE o.status = 'pending' AND o.created_at > '2026-03-09'
[2026-03-10 02:17:02] app-server: ERROR java.lang.OutOfMemoryError: GC overhead limit exceeded
[2026-03-10 02:17:02] app-server: FATAL service shutting down: unrecoverable error
[2026-03-10 02:17:05] nginx: no live upstreams while connecting to upstream
[2026-03-10 02:17:30] systemd: app-server.service: main process exited, code=exited, status=137
[2026-03-10 02:17:31] systemd: app-server.service: Unit entered failed state

Jordan