---
isPrivate: true
title: Agent FAQ
description: Datadog, the leading service for cloud-scale monitoring.
breadcrumbs: Docs > Agent > Agent FAQ
---

# Agent FAQ

- [Host Metrics with the Container Agent](https://docs.datadoghq.com/agent/faq/host-metrics-with-the-container-agent)
- [Downgrade the Agent to a prior major version](https://docs.datadoghq.com/agent/faq/agent-downgrade-major)
- [Downgrade the Agent to a prior minor version](https://docs.datadoghq.com/agent/faq/agent-downgrade-minor)
- [How does Datadog determine the Agent hostname?](https://docs.datadoghq.com/agent/faq/how-datadog-agent-determines-the-hostname)
- [How do I set up the Agent to run as a system service on macOS?](https://docs.datadoghq.com/agent/faq/macos-agent-run-as-system-service)
- [Error Restarting Agent: Already Listening on a Configured Port](https://docs.datadoghq.com/agent/faq/error-restarting-agent-already-listening-on-a-configured-port)
- [How do I use Kubernetes secrets to set my API key?](https://docs.datadoghq.com/agent/faq/kubernetes-secrets)
- [How do I run the kubernetes_state check as a cluster check?](https://docs.datadoghq.com/agent/faq/kubernetes-state-cluster-check)
- [RPM GPG Key Rotation](https://docs.datadoghq.com/agent/faq/rpm-gpg-key-rotation-agent-6)
- [Linux Agent 2022 Key Rotation](https://docs.datadoghq.com/agent/faq/linux-agent-2022-key-rotation)
- [Agent v5 - Certificate Authority Update (2025)](https://docs.datadoghq.com/agent/faq/agent-5-sectigo-root-ca-rotation)
- [Datadog Agent v6 Changes](https://docs.datadoghq.com/agent/faq/agent-v6-changes)
- [IMDSv2 Enablement by Default](https://docs.datadoghq.com/agent/faq/ec2_imdsv2_transition_payload_enabled)
- [Windows EC2 hostnames starting with EC2AMAZ-](https://docs.datadoghq.com/agent/faq/ec2-use-win-prefix-detection)
- [Auto-configuration for Autodiscovery](https://docs.datadoghq.com/agent/guide/auto_conf)
- [Template variables used for Autodiscovery](https://docs.datadoghq.com/agent/guide/template_variables)
- [Commonly Used Log Processing Rules](https://docs.datadoghq.com/logs/guide/commonly-used-log-processing-rules)
- [Docker Hub](https://docs.datadoghq.com/agent/faq/docker-hub)
- [Send traffix to Datadog using HAProxy](https://docs.datadoghq.com/agent/faq/proxy_example_haproxy)
- [Send traffix to Datadog using NGINX](https://docs.datadoghq.com/agent/faq/proxy_example_nginx)
- [Agent FIPS proxy](https://docs.datadoghq.com/agent/faq/fips_proxy)