System Logs & Milestones

A chronological view of how the Observability Hub evolved from a local lab into an infrastructure, Kubernetes, and observability platform with automation, incident response, and cost-aware telemetry analysis.

Chapter 12: GitOps & Operational Maturity

The day-two operations chapter: hardening the platform with ArgoCD reconciliation, deterministic Kustomize rendering, Trivy-backed workload security, safer rollouts, and a clearer GitOps operating model.

  • Trivy-Verified Workload Hardening

    • Established a Trivy-verified workload hardening baseline for platform-managed containers and Kubernetes manifests.
    • Strengthened the GitOps security posture by making container runtime controls part of the source of truth.
    📄 ADR 024: Trivy-Verified Workload Hardening

  • Kustomize & RBAC Render Hardening

    • Resolved duplicate resource and namespace collision failures in the tiered Kustomize tree.
    • Split cross-namespace RBAC from overlay-scoped resources so GitOps rendering stayed deterministic.
    📄 RCA 005: Kustomize RBAC Resource Collision

  • ArgoCD GitOps & Automated Fleet Promotion

    • Transitioned the cluster to ArgoCD for continuous reconciliation instead of imperative scripts.
    • Adopted the App-of-Apps pattern to manage the platform from a single source of truth.
    • Validated the GitOps promotion loop by fixing image pull failures caused by SHA-length mismatches.
    • Enabled ArgoCD to reconcile private GHCR images and roll updates across the simulation fleet.
    📄 Screenshot: ArgoCD Fleet Update

Chapter 11: eBPF-Native Efficiency & Networking

The kernel-visibility chapter: using Cilium, Hubble, and Kepler to inspect network flows, protocol behavior, and infrastructure efficiency below the application layer.

Chapter 10: The MCP Era

The agent-native operations chapter: building an MCP gateway for live telemetry, Kubernetes, and host state; reducing noisy observability payloads with Rust; and proving the design with Go-vs-Rust benchmarks for faster, lower-cost investigations.

  • Rust Telemetry Processing Benchmarks

    • Benchmarked Go and Rust telemetry processors against the same 24-hour Loki and Prometheus payloads.
    • Established Rust as the faster reduction path, especially for metric summarization where numeric parsing and statistical aggregation dominate.
    📄 ADR 023: Benchmark-Validated Rust Obs Processor

  • Structured Obs Processor Summaries

    • Upgraded summaries from compressed strings to structured records with timestamps and investigation context.
    • Improved log and metric investigation quality while benchmarks still showed major context reduction.
    📄 ADR 022: Obs Processor Structured Summaries

  • mcp_obs_hub: Unified Agentic Gateway

    • Consolidated telemetry, pods, and hub services into a single `mcp_obs_hub` binary to reduce management overhead.

  • MCP Telemetry and Infrastructure Intelligence

    • Exposed metrics, semantic logs, distributed traces, Kubernetes events, and host state through MCP.
    • Split capabilities into domain-isolated services to reduce blast radius and enforce least privilege.
    • Connected telemetry, pod state, and host-level signals for focused cross-layer debugging.
    • Introduced `investigate_incident` for structured incident reports from live platform signals.
    📄 ADR 017: Agentic Interface via MCP 📄 ADR 018: Domain-Isolated MCP Architecture 📄 ADR 019: Hybrid Host-MCP Intelligence

Chapter 9: The Terraform Era

The infrastructure-as-code chapter: moving Kubernetes platform services into OpenTofu so infrastructure state is declarative, reviewable, and easier to audit over time.

  • Platform Infrastructure: Immutable Orchestration via OpenTofu

    • Moved OpenTelemetry, Grafana, Prometheus, and the supporting K3s observability stack to OpenTofu.
    • Brought MinIO, Thanos, Loki, and Tempo into the same declarative infrastructure workflow.
    • Improved drift detection, persistent workload recovery, and cross-service telemetry discovery.
    📄 ADR 016: OpenTofu K3s Migration 📄 RCA 006: Loki Gateway DNS Timeout

Chapter 8: Platform Maturity & Reusability

The software-architecture chapter: refactoring the Go codebase into reusable internal packages so services, workers, and interfaces share tested platform logic.

  • Pure Wrapper Architecture & Advanced OTel

    • Transitioned the Go fleet to a standardized 'Pure Wrapper' architecture, enabling native OpenTelemetry support and advanced operational visibility across all services.
    📄 Note: OpenTelemetry & Observability Guide

  • Library-First Implementation

    • Executed the structural transition of the repository into the standard 'internal/' and 'cmd/' layout.
    • Decoupled core business logic into transport-agnostic modules to improve testability and reuse across platform interfaces.
    📄 ADR 014: Library-First Service Architecture

Chapter 7: The SRE Era

The observability maturity chapter: standardizing on OpenTelemetry, connecting logs, metrics, and traces, and using RCAs to turn incidents into durable operational knowledge.

  • Storage Scalability & Security Hardening

    • Moved telemetry storage to S3-compatible object storage with MinIO for better durability.
    • Established a safer default baseline across the core platform services.

  • Incident & Root Cause Analysis (RCA) Framework

    • Introduced a lightweight RCA workflow to document incidents and debugging steps.
    • Resolved the first incident by switching Grafana dashboard provisioning to JSON-from-file.
    📄 RCA 001: Grafana Provisioning Failure

Chapter 6: The Kubernetes Era

The Kubernetes chapter: moving the observability stack, PostgreSQL, and persistent workloads from standalone containers into K3s for resilient, self-healing operations.

Chapter 5: Vault via OpenBao

The security chapter: replacing scattered static environment variables with OpenBao-backed secrets, central policy, and safer credential access for services.

  • OpenBao Implementation

    • Replaced static environment variables with a secure OpenBao secret store and provider-agnostic secrets library.
    • Migrated 'system-metrics' and 'proxy' services to dynamic credential retrieval.

  • The Security Blueprint

    • Proposed transitioning to a centralized secret store to eliminate insecure static configuration files.
    • Evaluated HashiCorp Vault vs. OpenBao, selecting the latter for its truly open-source (MPL 2.0) and community-governed foundation.
    📄 ADR 010: Integrate OpenBao

Chapter 4: Orchestration & Event-Driven Pivot

The orchestration chapter: moving from timer-driven background work to event-driven webhooks, reducing wasted wakeups while preparing the platform for Kubernetes.

  • Orchestration Spike: k3s

    • Validated k3s orchestration via a 'Shadow Deployment,' proving cross-platform networking.
    • Introduced 'Safe-Mode' feature toggles to decouple database dependencies during prototyping.
    📄 ADR 007: k3s Shadow Deployment

Chapter 3: GitOps & Host Observability

The host-operations chapter: using GitOps-style synchronization and systemd journal ingestion to make host services repeatable, observable, and easier to recover.

  • GitOps Infrastructure & Host Observability

    • Implemented a secure, templated GitOps reconciliation engine for automated sync.
    • Scaled the GitOps engine to support multi-tenant synchronization across multiple repositories.
    • Established host-level Systemd journal ingestion into Loki via Promtail.
    • Added log parsing, labels, and allowlist controls for safer operational visibility.
    📄 ADR 005: GitOps Reconciliation

Chapter 2: The Platform Core

The platform-structure chapter: turning early services into a coherent system with shared libraries, structured logging, automated ingestion, and documented architecture decisions.

  • Shared Database Module

    • Standardized connection configuration and DSN generation in 'internal/db', enforcing safe defaults (UTC, SSL) across services.
    • Eliminated configuration drift by refactoring services to use the shared configuration module.
    📄 ADR 006: Shared Database Connection

  • Standardization & Logging

    • Implemented a shared 'internal/logger' to enforce consistent structured observability across all services.
    • Formalized 'Documentation as Code' by treating architectural decisions (ADRs) as first-class artifacts.
    📄 ADR 003: Shared Logging Library

  • Project Portal Launch

    • Released a self-hosted visualization portal to track system evolution and technical constraints.
    • Unified real-time system metrics and personal analytics via snapshots.

Chapter 1: The Genesis

The foundation chapter: building a reliable local lab, choosing PostgreSQL for durable telemetry storage, and bridging cloud-generated events into a self-hosted observability path.

  • Hybrid Cloud Architecture

    • Designed a secure "Store-and-Forward" bridge to ingest Azure Function telemetry without exposing local ports.
    • Decoupled stateless analytics from persistent storage to enable independent scaling.
    📄 ADR 002: Cloud-to-Local Bridge

  • Telemetry Engine Initialization

    • Built a lightweight Go proxy to emit structured telemetry for health and error tracking.
    • Unified logs and metrics into a single PostgreSQL JSONB schema, simplifying the data model.
    📄 ADR 001: Postgres vs InfluxDB

  • Reliable Local Lab

    • Establish core Docker infrastructure with automated volume management and backups.
    • Selected PostgreSQL over specialized TSDBs for long-term flexibility and reduced maintenance.