System slowdown after more than 1 day of operation

### Support guidelines

- [X] I've read the [support guidelines](https://github.com/crazy-max/docker-fail2ban/blob/master/.github/SUPPORT.md)

### I've found a bug and checked that ...

- [X] ... the documentation does not mention anything about my problem
- [X] ... there are no open or closed issues that are related to my problem

### Description

When running fail2ban as a docker container on the same host as my nginx proxy manager docker container the system slows down over a 24 hour period

### Expected behaviour

For the system to not slow down even if left alone for a week or more

### Actual behaviour

I have two servers that are functionally identical - two Raspberry Pi 4B 2GB boards with 120GB SSD via USB3 connectors. They run edge services using docker compose files.

edge1: `Linux edge1 6.1.21-v8+ #1642 SMP PREEMPT Mon Apr  3 17:24:16 BST 2023 aarch64 GNU/Linux`
edge2: `Linux edge2 6.1.21-v8+ #1642 SMP PREEMPT Mon Apr  3 17:24:16 BST 2023 aarch64 GNU/Linux`

<details>
<summary>edge1 containers</summary>
```BASH
$ docker container ls --all --format "table {{.Names}}\t{{.Size}}\t{{.Networks}}\t{{.Status}}\t{{.RunningFor}}\t{{.State}}" | (sed --unbuffered 1q;sort --key 1)
NAMES                  SIZE                      NETWORKS   STATUS                   CREATED        STATE
acme-sh-1              2B (virtual 40.3MB)       edge1      Up 3 minutes             4 days ago     running
diun-1                 0B (virtual 54.6MB)       edge1      Up 3 minutes             4 days ago     running
fail2ban               3.12kB (virtual 90.9MB)   host       Up 3 minutes (healthy)   4 days ago     running
netdata-1              707kB (virtual 395MB)     edge1      Up 3 minutes (healthy)   23 hours ago   running
npm                    42.4MB (virtual 858MB)    edge1      Up 3 minutes (healthy)   4 days ago     running
pihole-1               74.2MB (virtual 368MB)    host       Up 3 minutes (healthy)   23 hours ago   running
promtail-1             0B (virtual 185MB)        edge1      Up 3 minutes             3 days ago     running
scrutiny-collector-1   9.37kB (virtual 189MB)    edge1      Up 3 minutes             4 days ago     running
wireguard-1            23kB (virtual 167MB)      edge1      Up 3 minutes             4 days ago     running
```
</details>

<details>
<summary>edge2 containers</summary>
```BASH
$ docker container ls --all --format "table {{.Names}}\t{{.Size}}\t{{.Networks}}\t{{.Status}}\t{{.RunningFor}}\t{{.State}}" | (sed --unbuffered 1q;sort --key 1)
NAMES                  SIZE                      NETWORKS   STATUS                        CREATED              STATE
acme-sh-2              2B (virtual 40.3MB)       edge2      Up 23 hours                   4 days ago           running
diun-2                 0B (virtual 54.6MB)       edge2      Up 23 hours                   4 days ago           running
duckdns                21.7kB (virtual 40.8MB)   edge2      Up 22 hours                   22 hours ago         running
netdata-2              26.6kB (virtual 394MB)    edge2      Up About a minute (healthy)   About a minute ago   running
pihole-2               128MB (virtual 422MB)     host       Up 23 hours (healthy)         23 hours ago         running
promtail-2             0B (virtual 185MB)        edge2      Up 23 hours                   3 days ago           running
scrutiny-collector-2   9.37kB (virtual 189MB)    edge2      Up 23 hours                   4 days ago           running
wireguard-2            23kB (virtual 167MB)      edge2      Up 23 hours                   4 days ago           running
```
</details>

Generally, both servers need no daily maintenance and the Diun jobs run on Sundays to let me know what containers need updating (thanks for that, btw!).

I wanted to implement fail2ban in a docker container and used this version based on the good work done with Diun. I found a tutorial and followed it, amending the configuration to suit my needs. It works, and I sometimes get ban notifications.

However, after a day or so of usage the following will occur:
* System load increases
* Disk I/O increases
* Zombie processes spike
* Threads increase

According to my netdata metrics, this is due to fail2ban. I'm just not sure how to see what it was doing at the time.

### Steps to reproduce

1. Start server
2. Check all docker services are running
3. Wait 24+ hours
4. Monitor system performance
5. 

### Docker info

```text
Client: Docker Engine - Community
 Version:    24.0.4
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.11.1
    Path:     /usr/libexec/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.19.1
    Path:     /usr/libexec/docker/cli-plugins/docker-compose

Server:
 Containers: 9
  Running: 9
  Paused: 0
  Stopped: 0
 Images: 9
 Server Version: 24.0.4
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 3dce8eb055cbb6872793272b4f20ed16117344f8
 runc version: v1.1.7-0-g860f061
 init version: de40ad0
 Security Options:
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.1.21-v8+
 Operating System: Debian GNU/Linux 12 (bookworm)
 OSType: linux
 Architecture: aarch64
 CPUs: 4
 Total Memory: 1.855GiB
 Name: id-edge1
 ID: 7HKR:XS7T:KP55:WXII:JDYT:SCR5:EF3N:PHZA:XOAK:EWEP:3J7W:NWFN
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false
```


### Docker Compose config

```yaml
name: fail2ban
services:
  fail2ban:
    cap_add:
    - NET_ADMIN
    - NET_RAW
    container_name: fail2ban
    dns:
    - 192.168.1.1
    environment:
      F2B_DB_PURGE_AGE: 14d
      F2B_LOG_LEVEL: WARNING
      F2B_LOG_TARGET: STDOUT
      TZ: America/Edmonton
    hostname: edge1
    image: ghcr.io/crazy-max/fail2ban:latest
    network_mode: host
    restart: unless-stopped
    volumes:
    - type: bind
      source: /srv/fail2ban/data
      target: /data
      bind:
        create_host_path: true
    - type: bind
      source: /srv/nginx-proxy-manager/data/logs
      target: /var/log/npm
      read_only: true
      bind:
        create_host_path: true
    - type: bind
      source: /etc/timezone
      target: /etc/timezone
      read_only: true
      bind:
        create_host_path: true
    - type: bind
      source: /etc/localtime
      target: /etc/localtime
      read_only: true
      bind:
        create_host_path: true
```


### Logs

```text
fail2ban  | Setting timezone to America/Edmonton...
fail2ban  | ln: /etc/localtime: File exists
fail2ban  | /entrypoint.sh: line 40: /etc/timezone: Read-only file system
fail2ban  | Setting SSMTP configuration...
fail2ban  | WARNING: SSMTP_HOST must be defined if you want fail2ban to send emails
fail2ban  | Initializing files and folders...
fail2ban  | Setting Fail2ban configuration...
fail2ban  | Checking for custom actions in /data/action.d...
fail2ban  |   Add custom action action-ban-docker-f-b.conf...
fail2ban  |   Add custom action telegram_notif.sh...
fail2ban  | Checking for custom filters in /data/filter.d...
fail2ban  |   Add custom filter npm-general-f-b.conf...
fail2ban  | 2023-07-07 15:49:10,951 fail2ban.configreader   [1]: INFO    Loading configs for fail2ban under /etc/fail2ban
fail2ban  | 2023-07-07 15:49:10,956 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/fail2ban.conf']
fail2ban  | 2023-07-07 15:49:10,958 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/fail2ban.conf']
fail2ban  | 2023-07-07 15:49:10,959 fail2ban                [1]: INFO    Using socket file /var/run/fail2ban/fail2ban.sock
fail2ban  | 2023-07-07 15:49:10,959 fail2ban                [1]: INFO    Using pid file /var/run/fail2ban/fail2ban.pid, [WARNING] logging to STDOUT
fail2ban  | 2023-07-07 15:49:10,967 fail2ban.configreader   [1]: INFO    Loading configs for jail under /etc/fail2ban
fail2ban  | 2023-07-07 15:49:10,969 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/jail.conf']
fail2ban  | 2023-07-07 15:49:10,998 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-debian.conf']
fail2ban  | 2023-07-07 15:49:11,002 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-common.conf']
fail2ban  | 2023-07-07 15:49:11,008 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-overrides.local']
fail2ban  | 2023-07-07 15:49:11,011 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/jail.d/jail.local']
fail2ban  | 2023-07-07 15:49:11,014 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-common.conf', '/etc/fail2ban/paths-debian.conf', '/etc/fail2ban/jail.conf', '/etc/fail2ban/jail.d/jail.local']
fail2ban  | 2023-07-07 15:49:11,016 fail2ban.configreader   [1]: WARNING 'allowipv6' not defined in 'Definition'. Using default one: 'auto'
fail2ban  | 2023-07-07 15:49:11,043 fail2ban.configreader   [1]: INFO    Loading configs for filter.d/npm-general-f-b under /etc/fail2ban
fail2ban  | 2023-07-07 15:49:11,045 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/filter.d/npm-general-f-b.conf']
fail2ban  | 2023-07-07 15:49:11,047 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/filter.d/npm-general-f-b.conf']
fail2ban  | 2023-07-07 15:49:11,051 fail2ban.configreader   [1]: INFO    Loading configs for action.d/action-ban-docker-f-b under /etc/fail2ban
fail2ban  | 2023-07-07 15:49:11,053 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/action.d/action-ban-docker-f-b.conf']
fail2ban  | 2023-07-07 15:49:11,055 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/action.d/action-ban-docker-f-b.conf']
fail2ban  | Server ready
fail2ban  | Setting timezone to America/Edmonton...
fail2ban  | Setting SSMTP configuration...
fail2ban  | WARNING: SSMTP_HOST must be defined if you want fail2ban to send emails
fail2ban  | Initializing files and folders...
fail2ban  | ln: /etc/localtime: File exists
fail2ban  | /entrypoint.sh: line 40: /etc/timezone: Read-only file system
fail2ban  | Setting Fail2ban configuration...
fail2ban  | Checking for custom actions in /data/action.d...
fail2ban  |   WARNING: action-ban-docker-f-b.conf already exists and will be overriden
fail2ban  |   Add custom action action-ban-docker-f-b.conf...
fail2ban  |   WARNING: telegram_notif.sh already exists and will be overriden
fail2ban  |   Add custom action telegram_notif.sh...
fail2ban  | Checking for custom filters in /data/filter.d...
fail2ban  |   WARNING: npm-general-f-b.conf already exists and will be overriden
fail2ban  |   Add custom filter npm-general-f-b.conf...
fail2ban  | 2023-07-08 23:00:12,148 fail2ban.configreader   [1]: INFO    Loading configs for fail2ban under /etc/fail2ban
fail2ban  | 2023-07-08 23:00:12,158 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/fail2ban.conf']
fail2ban  | 2023-07-08 23:00:12,161 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/fail2ban.conf']
fail2ban  | 2023-07-08 23:00:12,162 fail2ban                [1]: INFO    Using socket file /var/run/fail2ban/fail2ban.sock
fail2ban  | 2023-07-08 23:00:12,162 fail2ban                [1]: INFO    Using pid file /var/run/fail2ban/fail2ban.pid, [WARNING] logging to STDOUT
fail2ban  | 2023-07-08 23:00:12,197 fail2ban.configreader   [1]: INFO    Loading configs for jail under /etc/fail2ban
fail2ban  | 2023-07-08 23:00:12,201 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/jail.conf']
fail2ban  | 2023-07-08 23:00:12,254 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-debian.conf']
fail2ban  | 2023-07-08 23:00:12,269 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-common.conf']
fail2ban  | 2023-07-08 23:00:12,283 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-overrides.local']
fail2ban  | 2023-07-08 23:00:12,285 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/jail.d/jail.local']
fail2ban  | 2023-07-08 23:00:12,289 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-common.conf', '/etc/fail2ban/paths-debian.conf', '/etc/fail2ban/jail.conf', '/etc/fail2ban/jail.d/jail.local']
fail2ban  | 2023-07-08 23:00:12,295 fail2ban.configreader   [1]: WARNING 'allowipv6' not defined in 'Definition'. Using default one: 'auto'
fail2ban  | 2023-07-08 23:00:12,356 fail2ban.configreader   [1]: INFO    Loading configs for filter.d/npm-general-f-b under /etc/fail2ban
fail2ban  | 2023-07-08 23:00:12,358 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/filter.d/npm-general-f-b.conf']
fail2ban  | 2023-07-08 23:00:12,365 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/filter.d/npm-general-f-b.conf']
fail2ban  | 2023-07-08 23:00:12,379 fail2ban.configreader   [1]: INFO    Loading configs for action.d/action-ban-docker-f-b under /etc/fail2ban
fail2ban  | 2023-07-08 23:00:12,381 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/action.d/action-ban-docker-f-b.conf']
fail2ban  | 2023-07-08 23:00:12,397 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/action.d/action-ban-docker-f-b.conf']
fail2ban  | Server ready
fail2ban  | 2023-07-08 23:00:18,583 fail2ban.utils          [1]: ERROR   7f9a787270 -- exec: bash /data/action.d/telegram_notif.sh -a start
fail2ban  | 2023-07-08 23:00:18,583 fail2ban.utils          [1]: ERROR   7f9a787270 -- returned 6
fail2ban  | 2023-07-08 23:00:18,584 fail2ban.actions        [1]: ERROR   Failed to start jail 'npm-general-f-b' action 'action-ban-docker-f-b': Error starting action Jail('npm-general-f-b')/action-ban-docker-f-b: 'Script error'
fail2ban  | 2023-07-09 11:50:38,474 fail2ban.actions        [1]: WARNING [npm-general-f-b] 184.70.188.106 already banned

[repeated every 5 minutes until]

fail2ban  | 2023-07-09 12:58:15,383 fail2ban.actions        [1]: WARNING [npm-general-f-b] 184.70.188.106 already banned
fail2ban  | Setting timezone to America/Edmonton...
fail2ban  | Setting SSMTP configuration...
fail2ban  | WARNING: SSMTP_HOST must be defined if you want fail2ban to send emails
fail2ban  | Initializing files and folders...
fail2ban  | ln: /etc/localtime: File exists
fail2ban  | /entrypoint.sh: line 40: /etc/timezone: Read-only file system
fail2ban  | Setting Fail2ban configuration...
fail2ban  | Checking for custom actions in /data/action.d...
fail2ban  |   WARNING: action-ban-docker-f-b.conf already exists and will be overriden
fail2ban  |   Add custom action action-ban-docker-f-b.conf...
fail2ban  |   WARNING: telegram_notif.sh already exists and will be overriden
fail2ban  |   Add custom action telegram_notif.sh...
fail2ban  | Checking for custom filters in /data/filter.d...
fail2ban  |   WARNING: npm-general-f-b.conf already exists and will be overriden
fail2ban  |   Add custom filter npm-general-f-b.conf...
fail2ban  | 2023-07-10 08:24:32,151 fail2ban.configreader   [1]: INFO    Loading configs for fail2ban under /etc/fail2ban
fail2ban  | 2023-07-10 08:24:32,157 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/fail2ban.conf']
fail2ban  | 2023-07-10 08:24:32,160 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/fail2ban.conf']
fail2ban  | 2023-07-10 08:24:32,161 fail2ban                [1]: INFO    Using socket file /var/run/fail2ban/fail2ban.sock
fail2ban  | 2023-07-10 08:24:32,162 fail2ban                [1]: INFO    Using pid file /var/run/fail2ban/fail2ban.pid, [WARNING] logging to STDOUT
fail2ban  | 2023-07-10 08:24:32,176 fail2ban.configreader   [1]: INFO    Loading configs for jail under /etc/fail2ban
fail2ban  | 2023-07-10 08:24:32,178 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/jail.conf']
fail2ban  | 2023-07-10 08:24:32,223 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-debian.conf']
fail2ban  | 2023-07-10 08:24:32,227 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-common.conf']
fail2ban  | 2023-07-10 08:24:32,235 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-overrides.local']
fail2ban  | 2023-07-10 08:24:32,237 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/jail.d/jail.local']
fail2ban  | 2023-07-10 08:24:32,243 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-common.conf', '/etc/fail2ban/paths-debian.conf', '/etc/fail2ban/jail.conf', '/etc/fail2ban/jail.d/jail.local']
fail2ban  | 2023-07-10 08:24:32,245 fail2ban.configreader   [1]: WARNING 'allowipv6' not defined in 'Definition'. Using default one: 'auto'
fail2ban  | 2023-07-10 08:24:32,304 fail2ban.configreader   [1]: INFO    Loading configs for filter.d/npm-general-f-b under /etc/fail2ban
fail2ban  | 2023-07-10 08:24:32,306 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/filter.d/npm-general-f-b.conf']
fail2ban  | 2023-07-10 08:24:32,309 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/filter.d/npm-general-f-b.conf']
fail2ban  | 2023-07-10 08:24:32,312 fail2ban.configreader   [1]: INFO    Loading configs for action.d/action-ban-docker-f-b under /etc/fail2ban
fail2ban  | 2023-07-10 08:24:32,325 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/action.d/action-ban-docker-f-b.conf']
fail2ban  | 2023-07-10 08:24:32,329 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/action.d/action-ban-docker-f-b.conf']
fail2ban  | Server ready
fail2ban  | 2023-07-11 09:46:53,185 fail2ban.actions        [1]: WARNING [npm-general-f-b] 198.161.8.92 already banned
fail2ban  | 2023-07-11 17:05:32,996 fail2ban.actions        [1]: WARNING [npm-general-f-b] 198.161.51.65 already banned

[repeated every minute until]

fail2ban  | 2023-07-11 17:10:14,200 fail2ban.actions        [1]: WARNING [npm-general-f-b] 198.161.51.65 already banned
fail2ban  | 2023-07-12 13:24:47,594 fail2ban.observer       [1]: ERROR   can't start new thread
fail2ban  | Traceback (most recent call last):
fail2ban  |   File "/usr/lib/python3.10/site-packages/fail2ban/server/observer.py", line 221, in run
fail2ban  |     meth(*ev[1:])
fail2ban  |   File "/usr/lib/python3.10/site-packages/fail2ban/server/observer.py", line 361, in db_purge
fail2ban  |     self.add_named_timer('DB_PURGE', self.__db_purge_interval, 'db_purge')
fail2ban  |   File "/usr/lib/python3.10/site-packages/fail2ban/server/observer.py", line 119, in add_named_timer
fail2ban  |     t.start()
fail2ban  |   File "/usr/lib/python3.10/threading.py", line 935, in start
fail2ban  |     _start_new_thread(self._bootstrap, ())
fail2ban  | RuntimeError: can't start new thread
fail2ban  | Setting timezone to America/Edmonton...
fail2ban  | ln: /etc/localtime: File exists
fail2ban  | Setting SSMTP configuration...
fail2ban  | WARNING: SSMTP_HOST must be defined if you want fail2ban to send emails
fail2ban  | Initializing files and folders...
fail2ban  | /entrypoint.sh: line 40: /etc/timezone: Read-only file system
fail2ban  | Setting Fail2ban configuration...
fail2ban  | Checking for custom actions in /data/action.d...
fail2ban  |   WARNING: action-ban-docker-f-b.conf already exists and will be overriden
fail2ban  |   Add custom action action-ban-docker-f-b.conf...
fail2ban  |   WARNING: telegram_notif.sh already exists and will be overriden
fail2ban  |   Add custom action telegram_notif.sh...
fail2ban  | Checking for custom filters in /data/filter.d...
fail2ban  |   WARNING: npm-general-f-b.conf already exists and will be overriden
fail2ban  |   Add custom filter npm-general-f-b.conf...
fail2ban  | 2023-07-12 14:10:04,526 fail2ban.configreader   [1]: INFO    Loading configs for fail2ban under /etc/fail2ban
fail2ban  | 2023-07-12 14:10:04,531 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/fail2ban.conf']
fail2ban  | 2023-07-12 14:10:04,535 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/fail2ban.conf']
fail2ban  | 2023-07-12 14:10:04,536 fail2ban                [1]: INFO    Using socket file /var/run/fail2ban/fail2ban.sock
fail2ban  | 2023-07-12 14:10:04,536 fail2ban                [1]: INFO    Using pid file /var/run/fail2ban/fail2ban.pid, [WARNING] logging to STDOUT
fail2ban  | 2023-07-12 14:10:04,558 fail2ban.configreader   [1]: INFO    Loading configs for jail under /etc/fail2ban
fail2ban  | 2023-07-12 14:10:04,560 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/jail.conf']
fail2ban  | 2023-07-12 14:10:04,593 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-debian.conf']
fail2ban  | 2023-07-12 14:10:04,602 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-common.conf']
fail2ban  | 2023-07-12 14:10:04,606 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-overrides.local']
fail2ban  | 2023-07-12 14:10:04,608 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/jail.d/jail.local']
fail2ban  | 2023-07-12 14:10:04,615 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/paths-common.conf', '/etc/fail2ban/paths-debian.conf', '/etc/fail2ban/jail.conf', '/etc/fail2ban/jail.d/jail.local']
fail2ban  | 2023-07-12 14:10:04,617 fail2ban.configreader   [1]: WARNING 'allowipv6' not defined in 'Definition'. Using default one: 'auto'
fail2ban  | 2023-07-12 14:10:04,655 fail2ban.configreader   [1]: INFO    Loading configs for filter.d/npm-general-f-b under /etc/fail2ban
fail2ban  | 2023-07-12 14:10:04,657 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/filter.d/npm-general-f-b.conf']
fail2ban  | 2023-07-12 14:10:04,664 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/filter.d/npm-general-f-b.conf']
fail2ban  | 2023-07-12 14:10:04,671 fail2ban.configreader   [1]: INFO    Loading configs for action.d/action-ban-docker-f-b under /etc/fail2ban
fail2ban  | 2023-07-12 14:10:04,673 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/action.d/action-ban-docker-f-b.conf']
fail2ban  | 2023-07-12 14:10:04,677 fail2ban.configparserinc[1]: INFO      Loading files: ['/etc/fail2ban/action.d/action-ban-docker-f-b.conf']
fail2ban  | Server ready
```


### Additional info

The latest issue occurred just before 2023-07-12 01:00 MDT. The only entry in the docker logs for this day was "ERROR   can't start new thread" at 13:24 MDT, likely when I ssh'd into the server to check why it was so slow.

The fail2ban container can see the NPM logs:
```BASH
$ docker exec fail2ban ls -lha /var/log/npm/error.log
-rwxrwxr-x    1 1000     1000       25.6K May 26 12:11 /var/log/npm/error.log
```
The database appears to be valid:
```BASH
$ ls -lha data/db/
total 212K
drwxrwxr-x 2 idsvc docker 4.0K Jun 27 14:28 .
drwxrwxr-x 6 idsvc docker 4.0K Jul 11 14:48 ..
-rwxrwxr-x 1 idsvc docker 204K Jul 12 14:34 fail2ban.sqlite3
```

The issue appears to be iowait related:
![image](https://github.com/crazy-max/docker-fail2ban/assets/15875093/30271f45-4646-41b4-add7-7d443d7f750e)

Just before I rebooted the server, the number of fail2ban processes was at 1,655:
![image](https://github.com/crazy-max/docker-fail2ban/assets/15875093/dfc6b883-3cad-4b5f-a401-2ef39220bc17)


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System slowdown after more than 1 day of operation #147

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