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[v26.1.x] k/fetch: Add fetch_response_dropped_bytes metric#29989

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Lazin merged 2 commits intoredpanda-data:v26.1.xfrom
vbotbuildovich:backport-pr-29970-v26.1.x-827
Apr 9, 2026
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[v26.1.x] k/fetch: Add fetch_response_dropped_bytes metric#29989
Lazin merged 2 commits intoredpanda-data:v26.1.xfrom
vbotbuildovich:backport-pr-29970-v26.1.x-827

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@vbotbuildovich vbotbuildovich commented Mar 28, 2026

Backport of PR #29970

@Lazin @vbotbuildovich
k/fetch: Add fetch_response_dropped_bytes metric
1eb21d9 
The metric tracks read amplification in bytes.

Signed-off-by: Evgeny Lazin <4lazin@gmail.com>
(cherry picked from commit 7c45295)
@vbotbuildovich vbotbuildovich added this to the v26.1.x-next milestone Mar 28, 2026
@vbotbuildovich vbotbuildovich added the kind/backport PRs targeting a stable branch label Mar 28, 2026
@vbotbuildovich vbotbuildovich requested a review from Lazin March 28, 2026 22:25
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vbotbuildovich commented Apr 6, 2026

CI test results

test results on build#82778
test_status test_class test_method test_arguments test_kind job_url passed reason test_history
FLAKY(PASS) ShadowLinkingReplicationTests test_replication_with_failures null integration https://buildkite.com/redpanda/redpanda/builds/82778#019d62c7-e54f-4033-a39a-b66deca14c41 10/11 Test PASSES after retries.No significant increase in flaky rate(baseline=0.0000, p0=1.0000, reject_threshold=0.0100. adj_baseline=0.1000, p1=0.3487, trust_threshold=0.5000) https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=ShadowLinkingReplicationTests&test_method=test_replication_with_failures
FLAKY(PASS) DataMigrationsApiTest test_creating_and_listing_migrations null integration https://buildkite.com/redpanda/redpanda/builds/82778#019d62c4-e6e0-4a61-a1f8-c18f1d195951 10/11 Test PASSES after retries.No significant increase in flaky rate(baseline=0.0029, p0=1.0000, reject_threshold=0.0100. adj_baseline=0.1000, p1=0.3487, trust_threshold=0.5000) https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=DataMigrationsApiTest&test_method=test_creating_and_listing_migrations
FLAKY(PASS) DatalakeClusterRestoreTest test_restore_partition_spec {"catalog_type": "nessie", "cloud_storage_type": 1} integration https://buildkite.com/redpanda/redpanda/builds/82778#019d62c7-e54a-4344-8899-000ac0e759b2 10/11 Test PASSES after retries.No significant increase in flaky rate(baseline=0.0000, p0=1.0000, reject_threshold=0.0100. adj_baseline=0.1000, p1=0.3487, trust_threshold=0.5000) https://redpanda.metabaseapp.com/dashboard/87-tests?tab=142-dt-individual-test-history&test_class=DatalakeClusterRestoreTest&test_method=test_restore_partition_spec

@Lazin Lazin merged commit 9a4e302 into redpanda-data:v26.1.x Apr 9, 2026
18 checks passed
@tyson-redpanda tyson-redpanda modified the milestones: v26.1.x-next, v26.1.3 Apr 9, 2026
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@Lazin Lazin Lazin approved these changes

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