[testnet] Backport the LRU prefix caching of find_{keys,key_values}_by_prefix (#4576) by @MathieuDutSik in https://github.com/linera-io/linera-protocol/pull/4964
feat: Add Grafana Alloy configuration support for observability (backport to testnet_conway) by @eldios in https://github.com/linera-io/linera-protocol/pull/4944
web-thread backport to testnet_conway by @Twey in https://github.com/linera-io/linera-protocol/pull/4985
deployment: add support for the LRU cache by @eldios in https://github.com/linera-io/linera-protocol/pull/4981
Fix missing committee blob handling. (#4978) by @afck in https://github.com/linera-io/linera-protocol/pull/4993
Improve exporter logging. by @deuszx in https://github.com/linera-io/linera-protocol/pull/4996
[testnet] Allow filtering incoming messages by application. (#4989) by @afck in https://github.com/linera-io/linera-protocol/pull/5003
backport #4961: improve readability of BucketQueueView by @ma2bd in https://github.com/linera-io/linera-protocol/pull/5004
[testnet] Improve the speed of pre_save in BucketQueueView (#5011) by @MathieuDutSik in https://github.com/linera-io/linera-protocol/pull/5012
feat: refactor validator commands to hierarchical structure (backport #5009) by @eldios in https://github.com/linera-io/linera-protocol/pull/5022
[testnet] Add Amount::to_attos and abs_diff. (#5029) by @afck in https://github.com/linera-io/linera-protocol/pull/5030
db-v1-migration: add migration script and Docker Compose override by @eldios in https://github.com/linera-io/linera-protocol/pull/5027
Exporter: improve logging and add metric by @deuszx in https://github.com/linera-io/linera-protocol/pull/5037
linera-core: give more information when #5023 happens (#5026) by @Twey in https://github.com/linera-io/linera-protocol/pull/5032
Add Postgres DB backend for the indexer. by @deuszx in https://github.com/linera-io/linera-protocol/pull/4979
[testnet] Fix round oracle issue; deduplicate leader computation. (Partial backport of #5033) by @afck in https://github.com/linera-io/linera-protocol/pull/5046
Full Changelog: https://github.com/linera-io/linera-protocol/compare/v0.15.6...v0.15.7