prometheus

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Idea: store scrape cache as a trie instead of a map.

5

### Proposal This could reduce memory usage. Currently, both the [series cache](https://github.com/prometheus/prometheus/blob/5f9f01de1451561a4f63a9a6171d3f591e4f9e61/scrape/scrape.go#L969C2-L969C8) and the [dropped series cache](https://github.com/prometheus/prometheus/blob/5f9f01de1451561a4f63a9a6171d3f591e4f9e61/scrape/scrape.go#L973) are implemented as Go maps with the scraped metrics string as the key....

bboreham

[meta] PROM-35 Remote Write (PRW2.0) Stability

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## Context This is an umbrella issue collecting things we plan to implement for **the stable [Prometheus Remote Write 2.0 (PRW2.0)](https://prometheus.io/docs/specs/prw/remote_write_spec_2_0/) protocol and Prometheus implementation**; also described by the [PROM-35](https://github.com/prometheus/proposals/pull/35)...

bwplotka

WAL Replay not using more memory than before the restart

1

This is to track some ideas from https://github.com/prometheus/prometheus/issues/6934 The current algorithm tries to replay WAL as fast as possible after restart, which can use more memory than the Prometheus use....

bwplotka

Rules: Persist alerts 'keep_firing_for' state using file storage

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This PR resolves issue #13957 This is a second attempt using a file based storage to add persistence for alerts 'keep_firing_for' state which is currently lost whenever Prometheus restarts. Feedback...

mustafain117

LFX Mentorship: Wireframes for "Exploration" use-cases

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# What the Mentorship will explore? During the [March-May/2025 cohort of LFX mentorships](https://github.com/prometheus/prometheus/issues/15909), we performed UX Research to explore users' problems when sending and using OpenTelemetry Resource Attributes to Prometheus....

ArthurSens

index.ExpandPostings: double slice size instead of using append

8

Using `append` leads to more frequent resizing and copying of the slice https://github.com/prometheus/prometheus/blob/6693a913b24cca33b98a2d98f1f954d8415a4583/tsdb/index/postings.go#L537-L543 If we manually double the size of the slice ourselves, this should help with heap fragmentation and...

dimitarvdimitrov

azure: Support sovereign clouds for discovery and remote write features

5

Azure's Go SDK only has built in support for AzurePublic, AzureChina, and AzureGovernment clouds. Other national/sovereign clouds exist, along with edge scenarios, but they lack built-in SDK support for the...

wired010

Docs: Add storage.agent.wal-truncate-frequency flag

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## Overview This PR adds documentation for the `--storage.agent.wal-truncate-frequency` flag, which I found implemented in [cmd/prometheus/main.go](https://github.com/prometheus/prometheus/blob/main/cmd/prometheus/main.go) but noticed it was not documented. The flag controls how frequently the Write-Ahead Log...

yahavHalfon

docker compose 'configs' block causing issues on deploy

1

### What did you do? I have a docker-compose.yml and a stack.env and I would like to deploy it using ```bash docker compose --env-file stack.env up -d ``` I **also**...

divStar

[PRW 2.0]: Migrate gogo/proto to vtproto

7

*This work is under [Google Summer of Code 2024](https://summerofcode.withgoogle.com/programs/2024/projects/s9tV51nw). The last commit before the submission is https://github.com/prometheus/prometheus/pull/14904/commits/7ec814a0b27d31dcb2ae03174077fa7b7499ddeb*. This PR migrates the RW2.0 from [gogo/proto](https://github.com/gogo/protobuf) to [vtproto](https://github.com/planetscale/vtprotobuf/tree/main). The performance and memory...

tonyli233