tursodatabase/libsql

Replication lag metrics

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#829 opened on Dec 23, 2023

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enhancementgood first issuehelp wanted

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Description

Let's add metrics to measure replication lag so that you can observe it. For example, let's assume that the clocks are synchronized and take a timestamp when we stream out a page frame and compare that to the timestamp when we inject the frame to the replica WAL.

Contributor guide

Research direction
Add metrics to measure replication lag by timestamping page frames at streaming and injection into replica WAL. Ensure clock synchronization assumptions are documented.
Tech stack
c
Domain
backenddatabase
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Creplication concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50