VictoriaMetrics Observability Blog

Blog posts

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  • Open Source Tech
  • VictoriaMetrics

  The Data Race That Wasn't a Bug (and the One That Was)

  You turn on Go’s race detector and get a data race inside net/http that makes no sense at first. This post digs into how Go’s HTTP client really sends a request body, why it can keep reading your buffer after Client.Do has returned, why we decided that race is harmless in vmagent, and why the same behavior could corrupt data in vmauth, so we fixed it there.

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  • Go @ VictoriaMetrics
  • Open Source Tech

  How Go’s Built-in Map Works with Swiss Tables

  Go 1.24 replaced the built-in map’s bucket-based runtime with Swiss Tables. This article explains groups, control bytes, H1 and H2, probing, table growth, directories, deletion, load factor, and the experimental split-group layout.

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  • Go @ VictoriaMetrics
  • Open Source Tech

  Understanding Go's sync.Map from API to Hash Trie

  Go’s sync.Map now uses a hash trie. This article builds the implementation from a normal map, then explains lock-free reads, fine-grained writer locking, collisions, retries, deletion, Clear, Range, and the trade-offs against map plus RWMutex.

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  • Go

  Go 1.27 interactive tour

  An interactive tour of what’s new in Go 1.27: every notable language, runtime, and standard library change, with short runnable examples you can edit and run in the browser.

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  • Go @ VictoriaMetrics
  • Open Source Tech

  Monotonic and Wall Clock Time in the Go time package

  Operating systems expose a wall clock that can leap or slew with NTP and a monotonic clock that never runs backward. In Go, only time.Now (might) carries both readings, while values from time.Parse, time.Date, etc., are wall-clock-only—so naïve equality checks or time.Since on those can mislead when the system clock shifts.

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  • Go @ VictoriaMetrics
  • Open Source Tech

  Go synctest: Solving Flaky Tests

  Traditional concurrent Go tests can be flaky due to non-deterministic scheduler behavior and timing. Go 1.24’s experimental synctest feature provides deterministic testing by running goroutines in isolated ‘bubbles’ where a synthetic clock only advances when all internally managed goroutines are durably blocked.

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  • Go @ VictoriaMetrics
  • Open Source Tech

  Graceful Shutdown in Go: Practical Patterns

  Go applications can implement graceful shutdown by handling termination signals (SIGTERM, SIGINT) via os/signal or signal.NotifyContext. Shutdown must complete within a specified timeout (e.g., Kubernetes’ terminationGracePeriodSeconds)…

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  • Go @ VictoriaMetrics
  • Open Source Tech

  gRPC in Go: Streaming RPCs, Interceptors, and Metadata

  Go’s gRPC implementation uses code generation to create type-safe client and server interfaces. Streaming RPCs allow sending multiple messages over a single connection, perfect for real-time updates and continuous data flows. Interceptors provide middleware-like functionality for authentication, logging, and error handling without modifying your core service logic.

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  • Go @ VictoriaMetrics
  • Open Source Tech

  How Protobuf Works—The Art of Data Encoding

  Protocol Buffers is faster and smaller than JSON, but the interesting part is understanding why. This article breaks down the encoding techniques that make Protobuf efficient, backed by benchmark results and practical examples