Adding upstream version 1.44.3.upstream/1.44.3

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

3 files changed, 105 insertions, 0 deletions

diff --git a/health/guides/portcheck/portcheck_connection_fails.md b/health/guides/portcheck/portcheck_connection_fails.md
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+### Understand the alert
+
+This alert indicates that too many connections are failing to a specific TCP endpoint in the last 5 minutes. It suggests that the monitored service on that endpoint is most likely down, unreachable, or access is being denied by firewall/security rules.
+
+### Troubleshoot the alert
+
+1. Check the service
+   Investigate if the service at the endpoint (specific IP and port) is running as expected. Inspect service logs for issues, error messages, or indications of a shutdown event.
+
+2. Test the endpoint
+   Try to establish a connection to the flagged endpoint using tools like `telnet`, `curl`, or `nc`. These tools provide real-time feedback that can help identify problems with the endpoint:
+
+   Example using `telnet`:
+   ```
+   telnet IP_ADDRESS PORT_NUMBER
+   ```
+
+3. Examine firewall and security group rules
+   Verify if there are any recent changes or newly added firewall/security group rules that might be causing the connectivity issues. Look for any rules that could be blocking the monitored port specifically or the IP range.
+
+4. Inspect network connectivity
+   Check the network connectivity between the Netdata Agent and the monitored endpoint. Ensure there are no intermittent network failures or high latency affecting the communication between the two.
+
+5. Examine the alert configuration
+   Validate the alert configuration in the `netdata.conf` file to confirm that the alert thresholds and monitored percentage of failed connections are set appropriately.
+
+6. Check resource utilization
+   High resource utilization might affect the availability of the monitored endpoint. Check if the system hosting the service has enough resources available (CPU, memory, and storage) to serve incoming requests.
+
+### Useful resources
+
+1. [How to use netcat (nc) command: Examples for network testing/debugging](https://www.nixcraft.com/t/how-to-use-netcat-nc-command-examples-for-network-testing-debugging/3332)
diff --git a/health/guides/portcheck/portcheck_connection_timeouts.md b/health/guides/portcheck/portcheck_connection_timeouts.md
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+### Understand the alert
+
+The `portcheck_connection_timeouts` alert calculates the average ratio of connection timeouts when trying to connect to a TCP endpoint over the last 5 minutes. If you receive this alert, it means that the monitored TCP endpoint is unreachable, potentially due to networking issues or an overloaded host/service.
+
+This alert triggers a warning state when the ratio of timeouts is between 10-40% and a critical state if the ratio is greater than 40%.
+
+### Troubleshoot the alert
+
+1. Check the network connectivity
+   - Use the `ping` command to check network connectivity between your system and the monitored TCP endpoint.
+   ```
+   ping <tcp_endpoint_ip>
+   ```
+   If the connectivity is intermittent or not established, it indicates network issues. Reach out to your network administrator for assistance.
+
+2. Check the status of the monitored TCP service
+   - Identify the service running on the monitored TCP endpoint by checking the port number.
+   - Use the `netstat` command to check the service status:
+
+   ```
+   netstat -tnlp | grep <port_number>
+   ```
+   If the service is not running or unresponsive, restart the service or investigate further into the application logs for any issues.
+
+3. Verify the load on the TCP endpoint host
+   - Connect to the host and analyze its resource consumption (CPU, memory, disk I/O, and network bandwidth) with tools like `top`, `vmstat`, `iostat`, and `iftop`.
+   - Identify resource-consuming processes or applications and apply corrective measures (kill/restart the process, allocate more resources, etc.).
+
+4. Examine the firewall rules and security groups
+   - Ensure that there are no blocking rules or security groups for your incoming connections to the TCP endpoint.
+   - If required, update the rules or create new allow rules for the required ports and IP addresses.
+
+5. Check the Netdata configuration
+   - Review the Netdata configuration file `/etc/netdata/netdata.conf` to ensure the `portcheck` plugin settings are correctly configured for monitoring the TCP endpoint.
+   - If necessary, update and restart the Netdata agent.
+
+### Useful resources
+
+1. [Netstat Command in Linux](https://www.tecmint.com/20-netstat-commands-for-linux-network-management/)
+2. [Iostat Command Usage and Examples](https://www.thomas-krenn.com/en/wiki/Iostat_command_usage_and_examples)
+3. [Iftop Guide](https://www.tecmint.com/iftop-linux-network-bandwidth-monitoring-tool/)
diff --git a/health/guides/portcheck/portcheck_service_reachable.md b/health/guides/portcheck/portcheck_service_reachable.md
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+### Understand the alert
+
+This alert checks if a particular TCP service on a specified host and port is reachable. If the average percentage of successful checks within the last minute is below 75%, it triggers an alert indicating the TCP service is not functioning properly.
+
+### Troubleshoot the alert
+
+- Verify if the problem is network-related or service-related
+
+  1. Check if the host and port are correct and the service is configured to listen on that specific port.
+
+  2. Use `ping` or `traceroute` to diagnose the connectivity issues between your machine and the host.
+
+  3. Use `telnet` or `nc` to check if the specific port on the host is reachable. For example, `telnet example.com port_number` or `nc example.com port_number`.
+
+  4. Check the network configuration, firewall settings, and routing rules on both the local machine and the target host.
+
+- Check if the TCP service is running and functioning properly
+
+  1. Check the service logs for any errors or issues that may prevent it from working correctly.
+
+  2. Restart the service and monitor its behavior.
+
+  3. Investigate if there are any recent changes in the service configuration or updates that may cause the issue.
+
+  4. Monitor system resources such as CPU, memory, and disk usage to ensure they are not causing any performance bottlenecks.
+
+- Optimize the service configuration
+
+  1. Review the service's performance-related configurations and fine-tune them, if necessary.
+
+  2. Check if there are any optimizations or best practices that can be applied to boost the service performance and reliability.
+