In the context of rapid internet business expansion, multi-cloud deployment, and exponential asset growth, the monitoring platform is a critical infrastructure for ensuring service stability. This article provides a complete review of a major internet company’s monitoring platform evolution from 2019 to 2021 — from solving legacy monitoring performance bottlenecks, to implementing cross-cloud distributed monitoring, to cloud-native platform governance — presenting the full transformation of the monitoring system from 0 to 1 build → large-scale expansion → platform governance.

Building on our understanding of P2P core principles and Kademlia DHT, we now dive into two production-proven P2P protocols — the libp2p protocol stack and BitTorrent. They represent two different design philosophies: a general-purpose P2P framework versus a specialized file distribution protocol. libp2p Modular Architecture libp2p is the networking layer behind IPFS and Filecoin, providing a modular toolkit for building P2P applications. Its design philosophy is “pluggable network protocol stack for P2P applications” — developers compose transport, security, multiplexing, and application layers like building blocks.

In the full-link monitoring system of internet services, white-box monitoring focuses on proactively uncovering potential issues and predicting risks, while black-box monitoring is fault-oriented, rapidly detecting problems that have already occurred online. The two work together to form a complete monitoring closed loop. Most internet companies have long had a monitoring blind spot for public network services and the user-side last mile. User-side faults often only trigger investigation after users report issues. The black-box probing monitoring system was designed precisely to solve this industry pain point.

Kademlia is one of the most influential DHT (Distributed Hash Table) protocols, proposed by Petar Maymounkov and David Mazières in 2002. It is widely used in IPFS, BitTorrent, Ethereum, and many other systems. Kademlia’s revolutionary innovation lies in using XOR (exclusive or) as its distance metric, offering elegant mathematical properties and efficient routing algorithms. XOR Distance Metric Kademlia maps nodes and resources to the same 160-bit identifier space and defines the XOR distance function:

Recap In “Monitoring System Enterprise Architecture Evolution — Cross-Region Hybrid Cloud”, the monitoring system had gradually matured and evolved toward enterprise-level capabilities. This chapter briefly describes the construction of the probing capability during this period. Below is the development history of this system. During the construction of the monitoring platform, internal monitoring collection alone was insufficient to meet enterprise business needs. Before planning APM development, remote probing with black-box monitoring was also incorporated as a subsystem.

Recap In “Monitoring System Enterprise Architecture Evolution — First Steps with Prometheus”, the monitoring system had already been upgraded from a single-node architecture to a single IDC distributed architecture. The content of the previous article applies to both VM-based and container-based deployments. Prometheus is a product of the cloud-native era and is commonly used alongside Kubernetes, but Prometheus itself can also replace traditional monitoring solutions like Zabbix in non-Kubernetes environments. In this article, we begin to use Kubernetes deployment to upgrade the entire monitoring system architecture, making it more flexible for cross-region hybrid cloud business scenarios.

SRE (Site Reliability Engineering) is a core role in ensuring the availability of distributed services, and the monitoring system is the foundation of SRE work. This article focuses on SRE core principles, walking through the pain points of modern monitoring systems, technology stack selection, Prometheus core principles, and alerting best practices, offering a practical enterprise-grade monitoring construction methodology. SRE Core Principles: Stability is the #1 Metric SRE’s core is ensuring continuous service stability through engineering practices, focusing on capacity planning, cluster maintenance, fault tolerance, load balancing, and monitoring system construction. There are only 3 core measurement metrics:

As enterprise digitalization scales up, large organizations demand extreme capabilities from email systems: independent deployment, high availability, global interoperability, security protection, and load balancing. This article breaks down the practical architecture of a dedicated large enterprise email system, covering overall design, physical/logical deployment, core service systems, and the full send/receive mail flow, providing a reference technical solution for enterprise-level email architecture implementation. I. Overall System Architecture Design Large enterprise email systems adopt a layered architecture of “frontend gateway layer + load balancing layer + core service layer + backend independent mail system”, balancing security isolation, traffic scheduling, and business independence. The overall architecture is as follows:

Peer-to-Peer (P2P) networking is a decentralized architecture where every node acts as both a provider (Server) and consumer (Client). This architecture is widely used in file distribution (BitTorrent), cryptocurrency (Bitcoin), decentralized storage (IPFS), and many other domains. P2P vs Client-Server Architecture Before diving into P2P principles, let’s understand the fundamental differences through comparison: Feature Client-Server P2P Network Centralization Highly centralized Decentralized / Hybrid Single Point of Failure Exists Does not exist Scalability Limited by server Linear with node count Bandwidth Cost Borne by server Shared by nodes Fault Tolerance Low High Lookup Complexity O(1) O(log N) The core advantage of P2P lies in eliminating single points of bottleneck and failure, at the cost of introducing more complex node discovery and data routing mechanisms.

Prometheus is an open-source monitoring and time series database system that has gained widespread adoption in recent years. The official architecture diagram is shown below: