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feat(fleet): Add per-extension registry overrides for BYOC#47984

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baptiste.foy/fa/extensions-registries-for-byoc
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feat(fleet): Add per-extension registry overrides for BYOC#47984
BaptisteFoy wants to merge 2 commits intomainfrom
baptiste.foy/fa/extensions-registries-for-byoc

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@BaptisteFoy
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What does this PR do?

Adds support for per-extension registry overrides so each OCI extension (e.g. ddot) can be downloaded from a different registry than the default one. This is needed for BYOC (Bring Your Own Cloud) scenarios where extensions are hosted in customer-controlled registries.

Changes:

  • oci/download.go: New Downloader.WithRegistryOverride() method that creates a new Downloader with overridden registry settings while sharing the same HTTP client
  • extensions/extensions.go: New ExtensionRegistry type. Install() and Restore() now accept an overrides parameter that groups extensions by their effective registry, downloading the package once per distinct registry
  • datadog_agent_extensions.go: New extensionRegistryConfig struct and Extensions field on installerRegistryConfig. setRegistryConfig() now returns parsed per-extension overrides from installer.registry.extensions.<pkg>.<ext>
  • installer.go: Updated InstallExtensions() and RestoreExtensions() to pass nil overrides (daemon path)

Config format:

installer:
  registry:
    url: default.registry.com
    extensions:
      datadog-agent:
        ddot:
          url: custom.registry.com
          auth: password
          username: user
          password: pass

Motivation

BYOC customers need to host extensions in their own registries. Currently all extensions are downloaded from a single registry. This change allows per-extension registry overrides so each extension can come from a different registry.

Describe how you validated your changes

  • go build ./pkg/fleet/installer/... compiles
  • go test ./pkg/fleet/installer/oci/... — new tests for WithRegistryOverride (full + partial override, shared client, env isolation)
  • go test ./pkg/fleet/installer/packages/... — new tests for YAML config parsing with extension overrides
  • go test ./pkg/fleet/installer/packages/extensions/... — new tests for Install grouping by registry and nil overrides backwards compat
  • All existing tests continue to pass

Additional Notes

  • nil overrides = no change in behavior (full backwards compatibility)
  • Extensions sharing the same override URL are deduplicated into one download group
  • The daemon code path (installer.go) passes nil since it doesn't parse YAML config

@BaptisteFoy BaptisteFoy added changelog/no-changelog No changelog entry needed qa/done QA done before merge and regressions are covered by tests team/fleet labels Mar 18, 2026
@github-actions github-actions bot added the medium review PR review might take time label Mar 18, 2026
@dd-octo-sts dd-octo-sts bot added internal Identify a non-fork PR team/windows-products labels Mar 18, 2026
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agent-platform-auto-pr bot commented Mar 18, 2026

Files inventory check summary

File checks results against ancestor b8036ed6:

Results for datadog-agent_7.78.0~devel.git.675.a8370ca.pipeline.103323611-1_amd64.deb:

No change detected

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agent-platform-auto-pr bot commented Mar 18, 2026

Static quality checks

✅ Please find below the results from static quality gates
Comparison made with ancestor b8036ed
📊 Static Quality Gates Dashboard
🔗 SQG Job

Successful checks

Info

Quality gate Change Size (prev → curr → max)
agent_deb_amd64 +8.0 KiB (0.00% increase) 748.852 → 748.860 → 750.720
agent_deb_amd64_fips +8.0 KiB (0.00% increase) 707.202 → 707.210 → 711.230
agent_heroku_amd64 +8.0 KiB (0.00% increase) 312.800 → 312.808 → 320.580
agent_rpm_amd64 +8.0 KiB (0.00% increase) 748.836 → 748.844 → 750.690
agent_rpm_amd64_fips +8.0 KiB (0.00% increase) 707.186 → 707.194 → 711.210
agent_rpm_arm64_fips +8.48 KiB (0.00% increase) 688.655 → 688.664 → 694.440
agent_suse_amd64 +8.0 KiB (0.00% increase) 748.836 → 748.844 → 750.690
agent_suse_amd64_fips +8.0 KiB (0.00% increase) 707.186 → 707.194 → 711.210
agent_suse_arm64_fips +8.48 KiB (0.00% increase) 688.655 → 688.664 → 694.440
21 successful checks with minimal change (< 2 KiB)
Quality gate Current Size
agent_rpm_arm64 727.344 MiB
agent_suse_arm64 727.344 MiB
docker_agent_amd64 809.183 MiB
docker_agent_arm64 812.492 MiB
docker_agent_jmx_amd64 1000.099 MiB
docker_agent_jmx_arm64 992.186 MiB
docker_cluster_agent_amd64 203.684 MiB
docker_cluster_agent_arm64 218.167 MiB
docker_cws_instrumentation_amd64 7.142 MiB
docker_cws_instrumentation_arm64 6.689 MiB
docker_dogstatsd_amd64 39.199 MiB
docker_dogstatsd_arm64 37.445 MiB
dogstatsd_deb_amd64 29.843 MiB
dogstatsd_deb_arm64 27.995 MiB
dogstatsd_rpm_amd64 29.843 MiB
dogstatsd_suse_amd64 29.843 MiB
iot_agent_deb_amd64 43.065 MiB
iot_agent_deb_arm64 40.124 MiB
iot_agent_deb_armhf 40.860 MiB
iot_agent_rpm_amd64 43.066 MiB
iot_agent_suse_amd64 43.066 MiB
On-wire sizes (compressed)
Quality gate Change Size (prev → curr → max)
agent_deb_amd64 +12.26 KiB (0.01% increase) 174.184 → 174.196 → 177.700
agent_deb_amd64_fips +7.89 KiB (0.00% increase) 165.162 → 165.169 → 172.230
agent_heroku_amd64 +3.14 KiB (0.00% increase) 74.896 → 74.899 → 79.970
agent_rpm_amd64 -18.92 KiB (0.01% reduction) 177.113 → 177.094 → 180.780
agent_rpm_amd64_fips -4.41 KiB (0.00% reduction) 167.174 → 167.170 → 173.370
agent_rpm_arm64 +26.88 KiB (0.02% increase) 159.628 → 159.654 → 161.610
agent_rpm_arm64_fips +17.39 KiB (0.01% increase) 151.272 → 151.289 → 155.910
agent_suse_amd64 -18.92 KiB (0.01% reduction) 177.113 → 177.094 → 180.780
agent_suse_amd64_fips -4.41 KiB (0.00% reduction) 167.174 → 167.170 → 173.370
agent_suse_arm64 +26.88 KiB (0.02% increase) 159.628 → 159.654 → 161.610
agent_suse_arm64_fips +17.39 KiB (0.01% increase) 151.272 → 151.289 → 155.910
docker_agent_amd64 neutral 267.184 MiB → 271.240
docker_agent_arm64 neutral 254.466 MiB → 259.800
docker_agent_jmx_amd64 neutral 335.833 MiB → 339.870
docker_agent_jmx_arm64 neutral 319.110 MiB → 324.390
docker_cluster_agent_amd64 neutral 71.289 MiB → 72.920
docker_cluster_agent_arm64 neutral 66.923 MiB → 68.220
docker_cws_instrumentation_amd64 neutral 2.999 MiB → 3.330
docker_cws_instrumentation_arm64 neutral 2.729 MiB → 3.090
docker_dogstatsd_amd64 neutral 15.151 MiB → 15.820
docker_dogstatsd_arm64 neutral 14.479 MiB → 14.830
dogstatsd_deb_amd64 neutral 7.883 MiB → 8.790
dogstatsd_deb_arm64 neutral 6.770 MiB → 7.710
dogstatsd_rpm_amd64 neutral 7.894 MiB → 8.800
dogstatsd_suse_amd64 neutral 7.894 MiB → 8.800
iot_agent_deb_amd64 neutral 11.349 MiB → 12.040
iot_agent_deb_arm64 neutral 9.666 MiB → 10.450
iot_agent_deb_armhf neutral 9.893 MiB → 10.620
iot_agent_rpm_amd64 neutral 11.368 MiB → 12.060
iot_agent_suse_amd64 neutral 11.368 MiB → 12.060

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cit-pr-commenter-54b7da bot commented Mar 18, 2026

Regression Detector

Regression Detector Results

Metrics dashboard
Target profiles
Run ID: 40c98816-1d4f-4e5a-8069-b9ed3bb34c61

Baseline: b8036ed
Comparison: a8370ca
Diff

Optimization Goals: ✅ No significant changes detected

Experiments ignored for regressions

Regressions in experiments with settings containing erratic: true are ignored.

perf experiment goal Δ mean % Δ mean % CI trials links
docker_containers_cpu % cpu utilization +7.12 [+3.98, +10.25] 1 Logs

Fine details of change detection per experiment

perf experiment goal Δ mean % Δ mean % CI trials links
docker_containers_cpu % cpu utilization +7.12 [+3.98, +10.25] 1 Logs
quality_gate_logs % cpu utilization +2.69 [+1.07, +4.30] 1 Logs bounds checks dashboard
otlp_ingest_metrics memory utilization +0.38 [+0.23, +0.54] 1 Logs
ddot_logs memory utilization +0.37 [+0.32, +0.43] 1 Logs
ddot_metrics memory utilization +0.12 [-0.05, +0.30] 1 Logs
file_tree memory utilization +0.12 [+0.06, +0.17] 1 Logs
quality_gate_metrics_logs memory utilization +0.10 [-0.14, +0.33] 1 Logs bounds checks dashboard
quality_gate_idle memory utilization +0.09 [+0.04, +0.13] 1 Logs bounds checks dashboard
file_to_blackhole_1000ms_latency egress throughput +0.02 [-0.39, +0.43] 1 Logs
tcp_dd_logs_filter_exclude ingress throughput +0.00 [-0.10, +0.10] 1 Logs
file_to_blackhole_100ms_latency egress throughput +0.00 [-0.09, +0.09] 1 Logs
uds_dogstatsd_to_api ingress throughput -0.00 [-0.20, +0.19] 1 Logs
file_to_blackhole_500ms_latency egress throughput -0.00 [-0.39, +0.39] 1 Logs
uds_dogstatsd_to_api_v3 ingress throughput -0.01 [-0.21, +0.19] 1 Logs
file_to_blackhole_0ms_latency egress throughput -0.03 [-0.50, +0.44] 1 Logs
tcp_syslog_to_blackhole ingress throughput -0.06 [-0.18, +0.06] 1 Logs
quality_gate_idle_all_features memory utilization -0.11 [-0.15, -0.07] 1 Logs bounds checks dashboard
docker_containers_memory memory utilization -0.22 [-0.29, -0.15] 1 Logs
ddot_metrics_sum_cumulativetodelta_exporter memory utilization -0.25 [-0.47, -0.02] 1 Logs
uds_dogstatsd_20mb_12k_contexts_20_senders memory utilization -0.30 [-0.36, -0.24] 1 Logs
ddot_metrics_sum_delta memory utilization -0.35 [-0.52, -0.18] 1 Logs
otlp_ingest_logs memory utilization -0.38 [-0.47, -0.29] 1 Logs
ddot_metrics_sum_cumulative memory utilization -0.50 [-0.64, -0.36] 1 Logs

Bounds Checks: ✅ Passed

perf experiment bounds_check_name replicates_passed observed_value links
docker_containers_cpu simple_check_run 10/10 565 ≥ 26
docker_containers_memory memory_usage 10/10 270.87MiB ≤ 370MiB
docker_containers_memory simple_check_run 10/10 698 ≥ 26
file_to_blackhole_0ms_latency memory_usage 10/10 0.19GiB ≤ 1.20GiB
file_to_blackhole_0ms_latency missed_bytes 10/10 0B = 0B
file_to_blackhole_1000ms_latency memory_usage 10/10 0.23GiB ≤ 1.20GiB
file_to_blackhole_1000ms_latency missed_bytes 10/10 0B = 0B
file_to_blackhole_100ms_latency memory_usage 10/10 0.19GiB ≤ 1.20GiB
file_to_blackhole_100ms_latency missed_bytes 10/10 0B = 0B
file_to_blackhole_500ms_latency memory_usage 10/10 0.22GiB ≤ 1.20GiB
file_to_blackhole_500ms_latency missed_bytes 10/10 0B = 0B
quality_gate_idle intake_connections 10/10 3 = 3 bounds checks dashboard
quality_gate_idle memory_usage 10/10 173.29MiB ≤ 175MiB bounds checks dashboard
quality_gate_idle_all_features intake_connections 10/10 2 ≤ 3 bounds checks dashboard
quality_gate_idle_all_features memory_usage 10/10 488.53MiB ≤ 550MiB bounds checks dashboard
quality_gate_logs intake_connections 10/10 3 ≤ 6 bounds checks dashboard
quality_gate_logs memory_usage 10/10 202.09MiB ≤ 220MiB bounds checks dashboard
quality_gate_logs missed_bytes 10/10 0B = 0B bounds checks dashboard
quality_gate_metrics_logs cpu_usage 10/10 349.77 ≤ 2000 bounds checks dashboard
quality_gate_metrics_logs intake_connections 10/10 4 ≤ 6 bounds checks dashboard
quality_gate_metrics_logs memory_usage 10/10 417.08MiB ≤ 475MiB bounds checks dashboard
quality_gate_metrics_logs missed_bytes 10/10 0B = 0B bounds checks dashboard

Explanation

Confidence level: 90.00%
Effect size tolerance: |Δ mean %| ≥ 5.00%

Performance changes are noted in the perf column of each table:

  • ✅ = significantly better comparison variant performance
  • ❌ = significantly worse comparison variant performance
  • ➖ = no significant change in performance

A regression test is an A/B test of target performance in a repeatable rig, where "performance" is measured as "comparison variant minus baseline variant" for an optimization goal (e.g., ingress throughput). Due to intrinsic variability in measuring that goal, we can only estimate its mean value for each experiment; we report uncertainty in that value as a 90.00% confidence interval denoted "Δ mean % CI".

For each experiment, we decide whether a change in performance is a "regression" -- a change worth investigating further -- if all of the following criteria are true:

  1. Its estimated |Δ mean %| ≥ 5.00%, indicating the change is big enough to merit a closer look.

  2. Its 90.00% confidence interval "Δ mean % CI" does not contain zero, indicating that if our statistical model is accurate, there is at least a 90.00% chance there is a difference in performance between baseline and comparison variants.

  3. Its configuration does not mark it "erratic".

CI Pass/Fail Decision

Passed. All Quality Gates passed.

  • quality_gate_logs, bounds check intake_connections: 10/10 replicas passed. Gate passed.
  • quality_gate_logs, bounds check missed_bytes: 10/10 replicas passed. Gate passed.
  • quality_gate_logs, bounds check memory_usage: 10/10 replicas passed. Gate passed.
  • quality_gate_idle_all_features, bounds check intake_connections: 10/10 replicas passed. Gate passed.
  • quality_gate_idle_all_features, bounds check memory_usage: 10/10 replicas passed. Gate passed.
  • quality_gate_idle, bounds check intake_connections: 10/10 replicas passed. Gate passed.
  • quality_gate_idle, bounds check memory_usage: 10/10 replicas passed. Gate passed.
  • quality_gate_metrics_logs, bounds check missed_bytes: 10/10 replicas passed. Gate passed.
  • quality_gate_metrics_logs, bounds check intake_connections: 10/10 replicas passed. Gate passed.
  • quality_gate_metrics_logs, bounds check cpu_usage: 10/10 replicas passed. Gate passed.
  • quality_gate_metrics_logs, bounds check memory_usage: 10/10 replicas passed. Gate passed.

@BaptisteFoy BaptisteFoy marked this pull request as ready for review March 18, 2026 15:42
@BaptisteFoy BaptisteFoy requested review from a team as code owners March 18, 2026 15:42
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Comment on lines +118 to +120
envCopy := *d.env
if url != "" {
envCopy.RegistryOverride = url

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P2 Badge Clear image-scoped overrides in WithRegistryOverride

WithRegistryOverride clones the full Env and only updates the global registry fields, but leaves RegistryOverrideByImage/auth-by-image maps intact; getRefAndKeychain gives those image-scoped entries precedence, so a set DD_INSTALLER_REGISTRY_URL_AGENT_PACKAGE can silently override the per-extension URL passed here. In that setup, extension-specific BYOC registry overrides are ignored and downloads still go to the package-scoped registry, so this needs to clear or rewrite image-scoped override maps on the copied env.

Useful? React with 👍 / 👎.

Comment on lines +143 to +144
span.SetTag("package_name", pkg.Name)
span.SetTag("package_version", pkg.Version)

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❓: Not sure how the tags work, but won't they be overwrite each time and only keep the last ?

Comment on lines +174 to +175
// We expect download errors (no real registry), not a panic or grouping error.
assert.Error(t, err)

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❓: Maybe assert for a "could not download package" pattern more reliable ?

Comment on lines +204 to +205
// Expect download failure (no real registry), not a grouping error
assert.Error(t, err)

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same

err := installSingle(ctx, pkg, extension, isExperiment, hooks)
for _, group := range groups {
// Download package metadata once per distinct registry
pkg, err := group.downloader.Download(ctx, url)

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❓: Not sure if it's the same url, but shouldn't we use the override one if any ?

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