What’s the best software for real-time cloud resource monitoring?

We’re working on a project that requires real-time visibility into cloud resources, and we’re trying to figure out which platforms are best at it. The goal is to spot performance issues quickly, keep usage under control, and avoid paying for underutilized resources — all without adding too much operational complexity.

Here are some top-rated options from G2 that stand out:

• Google Compute Engine – Solid infrastructure. How effective is its monitoring for real-time workloads?
• Azure Arc – Extends Azure management across environments. Does it deliver enough real-time insights for hybrid setups?
• CloudKeeper – Focused on cost and usage optimization. How strong is it at live monitoring?
• Azure Advisor – Native guidance within Azure. Does it provide enough granularity for real-time tracking?
• FortiGate Cloud – Security-driven platform. How well does it cover continuous monitoring of resources?

If you’ve used any of these for live monitoring, what worked best and what didn’t? Did the platform help you react faster to spikes or outages, or did you need extra tooling on top? Thanks!