feat: add Grafana Tempo distributed tracing to monitoring stack#590
feat: add Grafana Tempo distributed tracing to monitoring stack#590RacciDev-Bot wants to merge 6 commits into
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🧰 Additional context used📓 Path-based instructions (3)**/*.nix📄 CodeRabbit inference engine (.opencode/skills/code-style-nix)
Files:
modules/nixos/**/*.nix📄 CodeRabbit inference engine (.opencode/skills/modules/SKILL.md)
Files:
modules/nixos/server/**/*.nix📄 CodeRabbit inference engine (.opencode/skills/modules/SKILL.md)
Files:
🧠 Learnings (8)📚 Learning: 2026-04-13T14:02:32.760ZApplied to files:
📚 Learning: 2026-05-01T10:02:55.261ZApplied to files:
📚 Learning: 2026-05-01T14:14:49.691ZApplied to files:
📚 Learning: 2026-05-20T13:12:46.610ZApplied to files:
📚 Learning: 2026-05-01T09:11:22.009ZApplied to files:
📚 Learning: 2026-05-01T14:35:32.037ZApplied to files:
📚 Learning: 2026-06-20T14:33:25.328ZApplied to files:
📚 Learning: 2026-05-01T09:57:09.578ZApplied to files:
🔇 Additional comments (1)
📝 WalkthroughSummary by CodeRabbitRelease Notes
WalkthroughGrafana Tempo is added as a distributed tracing backend to the NixOS server monitoring collector. New NixOS options declare ChangesTempo Integration
Sequence DiagramsequenceDiagram
participant Servers as Application Servers
participant Alloy as Alloy OTLP Receiver
participant Exporter as otelcol.exporter.otlphttp tempo
participant Tempo as services.tempo port 4319
participant Storage as MinIO S3 tempo bucket
participant Grafana as Grafana Tempo datasource
participant User as LAN User
Servers->>Alloy: send traces OTLP
Alloy->>Exporter: route traces output
Exporter->>Tempo: POST /v1/traces
Tempo->>Storage: ingest, persist to S3
Grafana->>Tempo: query traces localhost:3200
User->>Grafana: explore traces via dashboard
Estimated code review effort🎯 2 (Simple) | ⏱️ ~12 minutes Possibly related PRs
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Actionable comments posted: 4
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@docs/src/components/server_monitoring.md`:
- Around line 128-130: Update the OTLP ingestion endpoint documentation in the
server_monitoring.md file to include the `/v1/traces` endpoint alongside the
existing `/v1/metrics` and `/v1/logs` endpoints. The current documentation lists
only the metrics and logs paths, but with Tempo integration support, the traces
endpoint should be explicitly documented as part of the standard OTLP/HTTP paths
available for ingestion.
In `@modules/nixos/server/monitoring/collector/grafana.nix`:
- Around line 66-72: The Tempo datasource block with name "Tempo" and type
"tempo" is currently always provisioned in the Grafana configuration regardless
of whether Tempo is enabled. Wrap this datasource configuration object in a
conditional that checks if the collector.tempo.enable option is true, ensuring
the datasource is only added to the provisioned datasources list when Tempo is
actually enabled. This will prevent a broken datasource from appearing in
Grafana when the Tempo feature is disabled.
In `@modules/nixos/server/monitoring/collector/tempo.nix`:
- Around line 24-27: The otlp receiver in the distributor.receivers block is
currently binding to all network interfaces (0.0.0.0) for the HTTP endpoint,
which exposes an internal service and increases attack surface. Change the
endpoint address in protocols.http.endpoint from 0.0.0.0 to 127.0.0.1 (loopback
address) to restrict access to local connections only, since this is an internal
communication path between Alloy and Tempo on the same host.
In `@modules/nixos/server/monitoring/options.nix`:
- Around line 106-109: The otlpPort option in the monitoring configuration uses
type = int which allows invalid port values outside the valid range of 0-65535.
Replace type = int with type = lib.types.port (which is an alias for
lib.types.ints.u16) to enforce port range validation during module evaluation,
catching configuration errors early rather than at runtime.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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docs/src/components/server_monitoring.mdmodules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/collector/tempo.nixmodules/nixos/server/monitoring/options.nix
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🧰 Additional context used
📓 Path-based instructions (8)
**/*.nix
📄 CodeRabbit inference engine (.opencode/skills/code-style-nix)
**/*.nix: Follow Nix code style conventions and best practices
Use consistent indentation and formatting in Nix configuration files
Follow established patterns for module organization in home-manager configurations
**/*.nix: Format code and check syntax usingnix fmt
Evaluate Nix expressions without building usingnix evalwith the target configuration path
Format specific Nix files or directories usingnix fmtfollowed by the file or directory path
Use--show-traceflag withnix buildornix evalcommands to diagnose evaluation errors
For infinite recursion errors in Nix builds, check for circular imports or conflicting option definitions
**/*.nix: Usebuiltins.traceto add trace statements and inspect values during Nix evaluation (format:builtins.trace "message: ${toString var}" var)
Usebuiltins.toJSONto convert complex Nix attribute sets to JSON for easier inspection during evaluation
Check for circular imports between modules and option definitions that depend on themselves to resolve infinite recursion errors
Verify attribute names are correct and imports are complete when debugging 'attribute not found' errors in Nix
Check option type definitions and ensure provided values match the expected type to resolve type mismatch errors
Read assertion messages and provide required configuration values when assertion failures occur in NixOS modulesRun
nix fmton all changed Nix files after modification
**/*.nix: Store sensitive data insecrets.yamlencrypted with sops instead of hardcoding passwords, API keys, or tokens in plain text
Declare sops secrets with properowner,group, andmodeattributes; use restrictive modes like0400for secrets files
SetrestartUnitsorreloadUnitsfor sops secrets declarations so services that depend on secrets are restarted when secrets change
Useconfig.sops.placeholderin sops templates instead of directly interpolating secret paths in multi-secret templates
Do not pass secrets as e...
Files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/collector/tempo.nix
modules/nixos/**/*.nix
📄 CodeRabbit inference engine (.opencode/skills/modules/SKILL.md)
modules/nixos/**/*.nix: NixOS module structure must follow standard pattern: define config, lib, pkgs as parameters; create cfg variable from config; define options with mkEnableOption, mkOption, mkIf; define config section with mkIf conditional
Create NixOS modules at file pathmodules/nixos/<category>/<name>.nixReusable NixOS module fragments should be placed in
modules/nixos/
Files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/collector/tempo.nix
modules/nixos/**/default.nix
📄 CodeRabbit inference engine (.opencode/skills/modules/SKILL.md)
Register NixOS modules in parent
default.nixusing imports list pattern
Files:
modules/nixos/server/monitoring/collector/default.nix
modules/nixos/server/**/*.nix
📄 CodeRabbit inference engine (.opencode/skills/modules/SKILL.md)
Use namespace
server.<name>for NixOS server cluster option modules
Files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/collector/tempo.nix
modules/**/**/default.nix
📄 CodeRabbit inference engine (.opencode/skills/modules/SKILL.md)
Use import list pattern in subdirectory
default.nixfiles: define imports array with list of .nix files (e.g.,imports = [ ./service-a.nix ./service-b.nix ])
Files:
modules/nixos/server/monitoring/collector/default.nix
docs/**/*
📄 CodeRabbit inference engine (.opencode/skills/project-structure/SKILL.md)
Project documentation should be placed in the
docs/directory
Files:
docs/src/components/server_monitoring.md
docs/src/**/*.md
📄 CodeRabbit inference engine (.opencode/skills/docs/SKILL.md)
docs/src/**/*.md: Use underscore filenames (e.g.,my_new_feature.md) instead of hyphens for documentation files
Keep documentation prose focused on behavior, architecture, usage examples, and operational notes; let generated fragments provide exhaustive option reference
Files:
docs/src/components/server_monitoring.md
docs/**/*.md
📄 CodeRabbit inference engine (AGENTS.md)
Verify documentation accurately reflects new behavior in docs/ directory before proceeding to commit
Files:
docs/src/components/server_monitoring.md
🧠 Learnings (7)
📚 Learning: 2026-04-13T14:02:32.760Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 546
File: hosts/server/nixdev/default.nix:18-18
Timestamp: 2026-04-13T14:02:32.760Z
Learning: When configuring NixOS Docker via `virtualisation.docker.daemon.settings`, it is valid to set `storage-driver = "overlayfs"` (do not flag it as an invalid Docker storage-driver). Use `overlayfs` specifically for Docker Engine 29+ and/or when the containerd snapshotter integration is enabled (`virtualisation.docker.features.containerd-snapshotter = true`). Treat this as the containerd snapshotter name for OverlayFS, distinct from the legacy `overlay2` classic Docker storage driver.
Applied to files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/collector/tempo.nix
📚 Learning: 2026-05-01T10:02:55.261Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 544
File: modules/nixos/core/sops.nix:49-53
Timestamp: 2026-05-01T10:02:55.261Z
Learning: In this nix-config repo, when declaring `sops.secrets` in Nix files, avoid explicitly setting `owner = "root"` and/or `group = "root"` if the intended ownership is root. `sops-nix` defaults `sops.secrets` to `root:root`, so adding these fields explicitly is redundant boilerplate.
Applied to files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/collector/tempo.nix
📚 Learning: 2026-05-01T14:14:49.691Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 544
File: modules/nixos/core/gaming.nix:119-119
Timestamp: 2026-05-01T14:14:49.691Z
Learning: When configuring the NixOS `wivrn` module option `services.wivrn.config.json.application`, pass the raw package/derivation (e.g., `pkgs.wayvr`) rather than converting it to a string executable path (e.g., `lib.getExe pkgs.wayvr`). The upstream module expects a list of derivations/packages (it internally `toList`s the value, asserts the first element is a derivation, and then resolves the executable internally). Code review should not recommend changing `pkgs.wayvr` to `lib.getExe pkgs.wayvr` for this option.
Applied to files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/collector/tempo.nix
📚 Learning: 2026-05-20T13:12:46.610Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 546
File: docs/site.nix:127-127
Timestamp: 2026-05-20T13:12:46.610Z
Learning: In DaRacci/nix-config, treating `passthru.discovery = false` as a known repo-wide convention to exclude a derivation from automated flake discovery/package CI. Do not require or flag an inline explanatory comment specifically for the absence of a comment when `passthru.discovery = false` is set.
Applied to files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/collector/tempo.nix
📚 Learning: 2026-05-01T09:11:22.009Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 544
File: modules/nixos/core/gaming.nix:65-65
Timestamp: 2026-05-01T09:11:22.009Z
Learning: In Nix code, do not flag shell-variable literals like "$XDG_RUNTIME_DIR" used inside Steam’s `extraEnv` (e.g., `pkgs.steam.override { extraEnv = { ... }; }`, including `modules/nixos/core/gaming.nix`). The Steam wrapper script expands these shell variables at runtime, so they should be treated as intended unexpanded literals rather than an interpolation/quoting mistake.
Applied to files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/collector/tempo.nix
📚 Learning: 2026-05-01T14:35:32.037Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 544
File: modules/nixos/core/remote.nix:153-179
Timestamp: 2026-05-01T14:35:32.037Z
Learning: In this repo’s NixOS module code (e.g., shell scripts produced via `writeShellApplication` inside `modules/nixos/**`), do not treat missing `XDG_STATE_HOME` fallbacks (like `${XDG_STATE_HOME:-$HOME/.local/state}`) as an error in the embedded shell script. On NixOS user sessions, `XDG_STATE_HOME` is reliably set via PAM/systemd, so flagging its absence as potentially unset is overly defensive for these generated scripts.
Applied to files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/collector/tempo.nix
📚 Learning: 2026-05-01T09:57:09.578Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 544
File: modules/nixos/services/ai-agent.nix:15-15
Timestamp: 2026-05-01T09:57:09.578Z
Learning: In this repo’s Nix modules, `inputs.services-zeroclaw` is a flake input that resolves to an attrset containing a `_file` attribute, and Nix coerces that attrset to a file path via `_file`. When importing/using it as a path in `imports` (e.g., `modules/nixos/services/ai-agent.nix`), use the string interpolation form "${inputs.services-zeroclaw}". Do not change it to `inputs.services-zeroclaw` (raw attrset form) in `imports`, because it will not work correctly.
Applied to files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/collector/tempo.nix
🔇 Additional comments (2)
modules/nixos/server/monitoring/collector/default.nix (1)
13-13: LGTM!modules/nixos/server/monitoring/collector/otlp.nix (1)
16-17: LGTM!Also applies to: 55-61, 72-72
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@modules/nixos/server/monitoring/collector/tempo.nix`:
- Around line 71-72: The two secret declarations for minioAccessKeySecret and
minioSecretKeySecret in the tempo collector configuration are currently empty
attribute sets. For each of these secret declarations, replace the empty braces
with explicit attributes that include owner, group, and mode to set proper
access controls, and add either restartUnits or reloadUnits to ensure services
depending on these secrets are properly restarted when the secrets change. This
applies to both the secrets entry for minioAccessKeySecret and the secrets entry
for minioSecretKeySecret.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
⚙️ Run configuration
Configuration used: Organization UI
Review profile: ASSERTIVE
Plan: Pro
Run ID: 2e3b0be1-3c0d-4049-9733-c0b154006c92
📒 Files selected for processing (4)
docs/src/components/server_monitoring.mdhosts/server/nixio/minio/policies/tempo.jsonmodules/nixos/server/monitoring/collector/tempo.nixmodules/nixos/server/monitoring/options.nix
📜 Review details
⏰ Context from checks skipped due to timeout. (2)
- GitHub Check: Mergify Merge Protections
- GitHub Check: Summary
🧰 Additional context used
📓 Path-based instructions (6)
**/*.nix
📄 CodeRabbit inference engine (.opencode/skills/code-style-nix)
**/*.nix: Follow Nix code style conventions and best practices
Use consistent indentation and formatting in Nix configuration files
Follow established patterns for module organization in home-manager configurations
**/*.nix: Format code and check syntax usingnix fmt
Evaluate Nix expressions without building usingnix evalwith the target configuration path
Format specific Nix files or directories usingnix fmtfollowed by the file or directory path
Use--show-traceflag withnix buildornix evalcommands to diagnose evaluation errors
For infinite recursion errors in Nix builds, check for circular imports or conflicting option definitions
**/*.nix: Usebuiltins.traceto add trace statements and inspect values during Nix evaluation (format:builtins.trace "message: ${toString var}" var)
Usebuiltins.toJSONto convert complex Nix attribute sets to JSON for easier inspection during evaluation
Check for circular imports between modules and option definitions that depend on themselves to resolve infinite recursion errors
Verify attribute names are correct and imports are complete when debugging 'attribute not found' errors in Nix
Check option type definitions and ensure provided values match the expected type to resolve type mismatch errors
Read assertion messages and provide required configuration values when assertion failures occur in NixOS modulesRun
nix fmton all changed Nix files after modification
**/*.nix: Store sensitive data insecrets.yamlencrypted with sops instead of hardcoding passwords, API keys, or tokens in plain text
Declare sops secrets with properowner,group, andmodeattributes; use restrictive modes like0400for secrets files
SetrestartUnitsorreloadUnitsfor sops secrets declarations so services that depend on secrets are restarted when secrets change
Useconfig.sops.placeholderin sops templates instead of directly interpolating secret paths in multi-secret templates
Do not pass secrets as e...
Files:
modules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/tempo.nix
modules/nixos/**/*.nix
📄 CodeRabbit inference engine (.opencode/skills/modules/SKILL.md)
modules/nixos/**/*.nix: NixOS module structure must follow standard pattern: define config, lib, pkgs as parameters; create cfg variable from config; define options with mkEnableOption, mkOption, mkIf; define config section with mkIf conditional
Create NixOS modules at file pathmodules/nixos/<category>/<name>.nixReusable NixOS module fragments should be placed in
modules/nixos/
Files:
modules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/tempo.nix
modules/nixos/server/**/*.nix
📄 CodeRabbit inference engine (.opencode/skills/modules/SKILL.md)
Use namespace
server.<name>for NixOS server cluster option modules
Files:
modules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/tempo.nix
docs/**/*
📄 CodeRabbit inference engine (.opencode/skills/project-structure/SKILL.md)
Project documentation should be placed in the
docs/directory
Files:
docs/src/components/server_monitoring.md
docs/src/**/*.md
📄 CodeRabbit inference engine (.opencode/skills/docs/SKILL.md)
docs/src/**/*.md: Use underscore filenames (e.g.,my_new_feature.md) instead of hyphens for documentation files
Keep documentation prose focused on behavior, architecture, usage examples, and operational notes; let generated fragments provide exhaustive option reference
Files:
docs/src/components/server_monitoring.md
docs/**/*.md
📄 CodeRabbit inference engine (AGENTS.md)
Verify documentation accurately reflects new behavior in docs/ directory before proceeding to commit
Files:
docs/src/components/server_monitoring.md
🧠 Learnings (7)
📚 Learning: 2026-04-13T14:02:32.760Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 546
File: hosts/server/nixdev/default.nix:18-18
Timestamp: 2026-04-13T14:02:32.760Z
Learning: When configuring NixOS Docker via `virtualisation.docker.daemon.settings`, it is valid to set `storage-driver = "overlayfs"` (do not flag it as an invalid Docker storage-driver). Use `overlayfs` specifically for Docker Engine 29+ and/or when the containerd snapshotter integration is enabled (`virtualisation.docker.features.containerd-snapshotter = true`). Treat this as the containerd snapshotter name for OverlayFS, distinct from the legacy `overlay2` classic Docker storage driver.
Applied to files:
modules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/tempo.nix
📚 Learning: 2026-05-01T10:02:55.261Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 544
File: modules/nixos/core/sops.nix:49-53
Timestamp: 2026-05-01T10:02:55.261Z
Learning: In this nix-config repo, when declaring `sops.secrets` in Nix files, avoid explicitly setting `owner = "root"` and/or `group = "root"` if the intended ownership is root. `sops-nix` defaults `sops.secrets` to `root:root`, so adding these fields explicitly is redundant boilerplate.
Applied to files:
modules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/tempo.nix
📚 Learning: 2026-05-01T14:14:49.691Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 544
File: modules/nixos/core/gaming.nix:119-119
Timestamp: 2026-05-01T14:14:49.691Z
Learning: When configuring the NixOS `wivrn` module option `services.wivrn.config.json.application`, pass the raw package/derivation (e.g., `pkgs.wayvr`) rather than converting it to a string executable path (e.g., `lib.getExe pkgs.wayvr`). The upstream module expects a list of derivations/packages (it internally `toList`s the value, asserts the first element is a derivation, and then resolves the executable internally). Code review should not recommend changing `pkgs.wayvr` to `lib.getExe pkgs.wayvr` for this option.
Applied to files:
modules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/tempo.nix
📚 Learning: 2026-05-20T13:12:46.610Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 546
File: docs/site.nix:127-127
Timestamp: 2026-05-20T13:12:46.610Z
Learning: In DaRacci/nix-config, treating `passthru.discovery = false` as a known repo-wide convention to exclude a derivation from automated flake discovery/package CI. Do not require or flag an inline explanatory comment specifically for the absence of a comment when `passthru.discovery = false` is set.
Applied to files:
modules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/tempo.nix
📚 Learning: 2026-05-01T09:11:22.009Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 544
File: modules/nixos/core/gaming.nix:65-65
Timestamp: 2026-05-01T09:11:22.009Z
Learning: In Nix code, do not flag shell-variable literals like "$XDG_RUNTIME_DIR" used inside Steam’s `extraEnv` (e.g., `pkgs.steam.override { extraEnv = { ... }; }`, including `modules/nixos/core/gaming.nix`). The Steam wrapper script expands these shell variables at runtime, so they should be treated as intended unexpanded literals rather than an interpolation/quoting mistake.
Applied to files:
modules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/tempo.nix
📚 Learning: 2026-05-01T14:35:32.037Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 544
File: modules/nixos/core/remote.nix:153-179
Timestamp: 2026-05-01T14:35:32.037Z
Learning: In this repo’s NixOS module code (e.g., shell scripts produced via `writeShellApplication` inside `modules/nixos/**`), do not treat missing `XDG_STATE_HOME` fallbacks (like `${XDG_STATE_HOME:-$HOME/.local/state}`) as an error in the embedded shell script. On NixOS user sessions, `XDG_STATE_HOME` is reliably set via PAM/systemd, so flagging its absence as potentially unset is overly defensive for these generated scripts.
Applied to files:
modules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/tempo.nix
📚 Learning: 2026-05-01T09:57:09.578Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 544
File: modules/nixos/services/ai-agent.nix:15-15
Timestamp: 2026-05-01T09:57:09.578Z
Learning: In this repo’s Nix modules, `inputs.services-zeroclaw` is a flake input that resolves to an attrset containing a `_file` attribute, and Nix coerces that attrset to a file path via `_file`. When importing/using it as a path in `imports` (e.g., `modules/nixos/services/ai-agent.nix`), use the string interpolation form "${inputs.services-zeroclaw}". Do not change it to `inputs.services-zeroclaw` (raw attrset form) in `imports`, because it will not work correctly.
Applied to files:
modules/nixos/server/monitoring/options.nixmodules/nixos/server/monitoring/collector/tempo.nix
🔇 Additional comments (3)
modules/nixos/server/monitoring/options.nix (1)
111-122: LGTM!modules/nixos/server/monitoring/collector/tempo.nix (1)
2-2: LGTM!Also applies to: 11-14, 42-47, 57-69, 75-77
hosts/server/nixio/minio/policies/tempo.json (1)
1-22: LGTM!
- Add tempo.nix module: monolithic Tempo service with MinIO-backed storage - Add collector.tempo.* options (enable, otlpPort) to options.nix - Wire Alloy OTLP receiver to export traces to Tempo when enabled - Add Tempo datasource to Grafana provisioning - Import tempo module in collector/default.nix - Update docs with Tempo architecture, virtual host table, and service commands
- Gate Tempo datasource behind collector.tempo.enable - Bind Tempo OTLP receiver to 127.0.0.1 (internal only) - Use lib.types.port for port options - Document /v1/traces as exposed OTLP path
- Replace swfsMount (s3fs FUSE mount to MinIO) with native S3 storage - storage.trace.backend changed from "local" to "s3" - WAL stays on local disk at /var/lib/tempo/wal - MinIO credentials injected via SOPS template into AWS env vars - Add minioAccessKeySecret / minioSecretKeySecret options - Add MinIO IAM policy for tempo bucket - Remove MinIO FUSE mount dependency
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🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@modules/nixos/server/monitoring/collector/otlp.nix`:
- Around line 55-61: In the otelcol.exporter.otlphttp "tempo" component's client
block, change the attribute name from `url` to `endpoint`. The endpoint value
should remain the base URL `http://127.0.0.1:${toString
cfg.collector.tempo.otlpPort}` without any path suffix like `/v1/traces`, as
Grafana Alloy automatically appends this suffix when exporting traces.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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docs/src/components/server_monitoring.mdhosts/server/nixio/minio/policies/tempo.jsonmodules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/collector/tempo.nixmodules/nixos/server/monitoring/options.nix
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📓 Path-based instructions (8)
**/*.nix
📄 CodeRabbit inference engine (.opencode/skills/code-style-nix)
**/*.nix: Follow Nix code style conventions and best practices
Use consistent indentation and formatting in Nix configuration files
Follow established patterns for module organization in home-manager configurations
**/*.nix: Format code and check syntax usingnix fmt
Evaluate Nix expressions without building usingnix evalwith the target configuration path
Format specific Nix files or directories usingnix fmtfollowed by the file or directory path
Use--show-traceflag withnix buildornix evalcommands to diagnose evaluation errors
For infinite recursion errors in Nix builds, check for circular imports or conflicting option definitions
**/*.nix: Usebuiltins.traceto add trace statements and inspect values during Nix evaluation (format:builtins.trace "message: ${toString var}" var)
Usebuiltins.toJSONto convert complex Nix attribute sets to JSON for easier inspection during evaluation
Check for circular imports between modules and option definitions that depend on themselves to resolve infinite recursion errors
Verify attribute names are correct and imports are complete when debugging 'attribute not found' errors in Nix
Check option type definitions and ensure provided values match the expected type to resolve type mismatch errors
Read assertion messages and provide required configuration values when assertion failures occur in NixOS modulesRun
nix fmton all changed Nix files after modification
**/*.nix: Store sensitive data insecrets.yamlencrypted with sops instead of hardcoding passwords, API keys, or tokens in plain text
Declare sops secrets with properowner,group, andmodeattributes; use restrictive modes like0400for secrets files
SetrestartUnitsorreloadUnitsfor sops secrets declarations so services that depend on secrets are restarted when secrets change
Useconfig.sops.placeholderin sops templates instead of directly interpolating secret paths in multi-secret templates
Do not pass secrets as e...
Files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/collector/tempo.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/options.nix
modules/nixos/**/*.nix
📄 CodeRabbit inference engine (.opencode/skills/modules/SKILL.md)
modules/nixos/**/*.nix: NixOS module structure must follow standard pattern: define config, lib, pkgs as parameters; create cfg variable from config; define options with mkEnableOption, mkOption, mkIf; define config section with mkIf conditional
Create NixOS modules at file pathmodules/nixos/<category>/<name>.nixReusable NixOS module fragments should be placed in
modules/nixos/
Files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/collector/tempo.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/options.nix
modules/nixos/**/default.nix
📄 CodeRabbit inference engine (.opencode/skills/modules/SKILL.md)
Register NixOS modules in parent
default.nixusing imports list pattern
Files:
modules/nixos/server/monitoring/collector/default.nix
modules/nixos/server/**/*.nix
📄 CodeRabbit inference engine (.opencode/skills/modules/SKILL.md)
Use namespace
server.<name>for NixOS server cluster option modules
Files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/collector/tempo.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/options.nix
modules/**/**/default.nix
📄 CodeRabbit inference engine (.opencode/skills/modules/SKILL.md)
Use import list pattern in subdirectory
default.nixfiles: define imports array with list of .nix files (e.g.,imports = [ ./service-a.nix ./service-b.nix ])
Files:
modules/nixos/server/monitoring/collector/default.nix
docs/**/*
📄 CodeRabbit inference engine (.opencode/skills/project-structure/SKILL.md)
Project documentation should be placed in the
docs/directory
Files:
docs/src/components/server_monitoring.md
docs/src/**/*.md
📄 CodeRabbit inference engine (.opencode/skills/docs/SKILL.md)
docs/src/**/*.md: Use underscore filenames (e.g.,my_new_feature.md) instead of hyphens for documentation files
Keep documentation prose focused on behavior, architecture, usage examples, and operational notes; let generated fragments provide exhaustive option reference
Files:
docs/src/components/server_monitoring.md
docs/**/*.md
📄 CodeRabbit inference engine (AGENTS.md)
Verify documentation accurately reflects new behavior in docs/ directory before proceeding to commit
Files:
docs/src/components/server_monitoring.md
🧠 Learnings (8)
📚 Learning: 2026-04-13T14:02:32.760Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 546
File: hosts/server/nixdev/default.nix:18-18
Timestamp: 2026-04-13T14:02:32.760Z
Learning: When configuring NixOS Docker via `virtualisation.docker.daemon.settings`, it is valid to set `storage-driver = "overlayfs"` (do not flag it as an invalid Docker storage-driver). Use `overlayfs` specifically for Docker Engine 29+ and/or when the containerd snapshotter integration is enabled (`virtualisation.docker.features.containerd-snapshotter = true`). Treat this as the containerd snapshotter name for OverlayFS, distinct from the legacy `overlay2` classic Docker storage driver.
Applied to files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/collector/tempo.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/options.nix
📚 Learning: 2026-05-01T10:02:55.261Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 544
File: modules/nixos/core/sops.nix:49-53
Timestamp: 2026-05-01T10:02:55.261Z
Learning: In this nix-config repo, when declaring `sops.secrets` in Nix files, avoid explicitly setting `owner = "root"` and/or `group = "root"` if the intended ownership is root. `sops-nix` defaults `sops.secrets` to `root:root`, so adding these fields explicitly is redundant boilerplate.
Applied to files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/collector/tempo.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/options.nix
📚 Learning: 2026-05-01T14:14:49.691Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 544
File: modules/nixos/core/gaming.nix:119-119
Timestamp: 2026-05-01T14:14:49.691Z
Learning: When configuring the NixOS `wivrn` module option `services.wivrn.config.json.application`, pass the raw package/derivation (e.g., `pkgs.wayvr`) rather than converting it to a string executable path (e.g., `lib.getExe pkgs.wayvr`). The upstream module expects a list of derivations/packages (it internally `toList`s the value, asserts the first element is a derivation, and then resolves the executable internally). Code review should not recommend changing `pkgs.wayvr` to `lib.getExe pkgs.wayvr` for this option.
Applied to files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/collector/tempo.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/options.nix
📚 Learning: 2026-05-20T13:12:46.610Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 546
File: docs/site.nix:127-127
Timestamp: 2026-05-20T13:12:46.610Z
Learning: In DaRacci/nix-config, treating `passthru.discovery = false` as a known repo-wide convention to exclude a derivation from automated flake discovery/package CI. Do not require or flag an inline explanatory comment specifically for the absence of a comment when `passthru.discovery = false` is set.
Applied to files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/collector/tempo.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/options.nix
📚 Learning: 2026-05-01T09:11:22.009Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 544
File: modules/nixos/core/gaming.nix:65-65
Timestamp: 2026-05-01T09:11:22.009Z
Learning: In Nix code, do not flag shell-variable literals like "$XDG_RUNTIME_DIR" used inside Steam’s `extraEnv` (e.g., `pkgs.steam.override { extraEnv = { ... }; }`, including `modules/nixos/core/gaming.nix`). The Steam wrapper script expands these shell variables at runtime, so they should be treated as intended unexpanded literals rather than an interpolation/quoting mistake.
Applied to files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/collector/tempo.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/options.nix
📚 Learning: 2026-05-01T14:35:32.037Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 544
File: modules/nixos/core/remote.nix:153-179
Timestamp: 2026-05-01T14:35:32.037Z
Learning: In this repo’s NixOS module code (e.g., shell scripts produced via `writeShellApplication` inside `modules/nixos/**`), do not treat missing `XDG_STATE_HOME` fallbacks (like `${XDG_STATE_HOME:-$HOME/.local/state}`) as an error in the embedded shell script. On NixOS user sessions, `XDG_STATE_HOME` is reliably set via PAM/systemd, so flagging its absence as potentially unset is overly defensive for these generated scripts.
Applied to files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/collector/tempo.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/options.nix
📚 Learning: 2026-06-20T14:33:25.328Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 590
File: modules/nixos/server/monitoring/collector/tempo.nix:71-72
Timestamp: 2026-06-20T14:33:25.328Z
Learning: When reviewing DaRacci/nix-config NixOS modules that use sops-nix, do not flag `sops.secrets` entries as missing `owner`, `group`, `mode`, or `restartUnits` if the secret declarations are only placeholder sources for `sops.templates`:
- The secret value is referenced exclusively via `config.sops.placeholder.<NAME>` inside a `sops.templates` definition (i.e., no other code reads the decrypted secret from the raw secret path).
- The rendered `sops.templates` output is what is used by systemd via a `systemd.services.*.serviceConfig.EnvironmentFile` (the template is the effective boundary).
In this pattern, the template’s own `restartUnits` are the relevant access-control/restart boundary; the raw `sops.secrets` files are only decrypted in-memory by sops-nix (run as root) to render the template. Therefore, empty-attrset `sops.secrets.<NAME> = { };` declarations should not be treated as missing permissions/restart hooks when they are only feeding a `sops.templates` placeholder.
Applied to files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/collector/tempo.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/options.nix
📚 Learning: 2026-05-01T09:57:09.578Z
Learnt from: DaRacci
Repo: DaRacci/nix-config PR: 544
File: modules/nixos/services/ai-agent.nix:15-15
Timestamp: 2026-05-01T09:57:09.578Z
Learning: In this repo’s Nix modules, `inputs.services-zeroclaw` is a flake input that resolves to an attrset containing a `_file` attribute, and Nix coerces that attrset to a file path via `_file`. When importing/using it as a path in `imports` (e.g., `modules/nixos/services/ai-agent.nix`), use the string interpolation form "${inputs.services-zeroclaw}". Do not change it to `inputs.services-zeroclaw` (raw attrset form) in `imports`, because it will not work correctly.
Applied to files:
modules/nixos/server/monitoring/collector/default.nixmodules/nixos/server/monitoring/collector/grafana.nixmodules/nixos/server/monitoring/collector/tempo.nixmodules/nixos/server/monitoring/collector/otlp.nixmodules/nixos/server/monitoring/options.nix
🔇 Additional comments (7)
modules/nixos/server/monitoring/options.nix (1)
20-20: LGTM!Also applies to: 95-122
modules/nixos/server/monitoring/collector/default.nix (1)
13-13: LGTM!modules/nixos/server/monitoring/collector/tempo.nix (1)
17-83: LGTM!hosts/server/nixio/minio/policies/tempo.json (1)
1-22: LGTM!modules/nixos/server/monitoring/collector/otlp.nix (1)
16-17: LGTM!Also applies to: 77-77
modules/nixos/server/monitoring/collector/grafana.nix (1)
66-73: LGTM!docs/src/components/server_monitoring.md (1)
4-4: LGTM!Also applies to: 23-23, 37-49, 120-130, 163-163, 188-188
| ${ | ||
| if tempoEnabled then | ||
| '' | ||
| otelcol.exporter.otlphttp "tempo" { | ||
| client { | ||
| url = "http://127.0.0.1:${toString cfg.collector.tempo.otlpPort}" | ||
| } |
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🧩 Analysis chain
🌐 Web query:
For Grafana Alloy's otelcol.exporter.otlphttpcomponent, what is the correctclient block attribute for destination (urlvsendpoint), and does traces export automatically append /v1/traces when given a base URL?
💡 Result:
For the Grafana Alloy otelcol.exporter.otlphttp component, the correct attribute within the client block is endpoint [1][2]. The attribute url is not used in the client configuration [1][3]. Yes, the otelcol.exporter.otlphttp component automatically appends /v1/traces to the base URL provided in the client.endpoint attribute when exporting traces, unless you explicitly override it using the top-level traces_endpoint argument [1][4][3]. Summary of behavior: - client.endpoint: Acts as the base URL for telemetry data [1][5]. - Default pathing: If traces_endpoint, metrics_endpoint, or logs_endpoint are not specified, the component defaults to appending /v1/traces, /v1/metrics, or /v1/logs to the client.endpoint respectively [1][3]. - Overriding: You can specify explicit paths for individual signals (e.g., traces_endpoint = "https://example.com/custom/traces") if you need to bypass this default behavior [1][4][5].
Citations:
- 1: https://grafana.com/docs/alloy/latest/reference/components/otelcol/otelcol.exporter.otlphttp/
- 2: https://grafana.com/docs/grafana-cloud/send-data/alloy/reference/components/otelcol/otelcol.exporter.otlphttp/
- 3: https://grafana.com/docs/alloy/next/reference/components/otelcol/otelcol.exporter.otlphttp/
- 4: https://github.com/grafana/alloy/blob/main/internal/component/otelcol/exporter/otlphttp/otlphttp.go
- 5: https://github.com/open-telemetry/opentelemetry-collector/tree/main/exporter/otlphttpexporter
Use endpoint instead of url in the client block.
The Grafana Alloy otelcol.exporter.otlphttp component's client block requires endpoint as the attribute name, not url. Additionally, the component automatically appends /v1/traces to the base endpoint URL when exporting traces, so no explicit suffix is needed.
Change:
client {
url = "http://127.0.0.1:${toString cfg.collector.tempo.otlpPort}"
}
To:
client {
endpoint = "http://127.0.0.1:${toString cfg.collector.tempo.otlpPort}"
}
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@modules/nixos/server/monitoring/collector/otlp.nix` around lines 55 - 61, In
the otelcol.exporter.otlphttp "tempo" component's client block, change the
attribute name from `url` to `endpoint`. The endpoint value should remain the
base URL `http://127.0.0.1:${toString cfg.collector.tempo.otlpPort}` without any
path suffix like `/v1/traces`, as Grafana Alloy automatically appends this
suffix when exporting traces.
2 participants
Summary
Adds Grafana Tempo as the distributed tracing backend to the monitoring stack.
Traces flow from OpenRouter → Alloy OTLP receiver (port 4318) → Tempo OTLP HTTP receiver (port 4319) → Grafana Tempo datasource.
Changes
collector.tempo.*options (enable, otlpPort)otelcol.exporter.otlphttpfor Tempo; traces no longer dropped when tempo is enabledhttp://localhost:3200Architecture
Tempo runs in monolithic mode (
target = "all") with local filesystem storage on MinIO-backed mount. Alloy remains the single OTLP ingress point; traces are forwarded to Tempo via the OTLP HTTP exporter whencollector.tempo.enable = true.Testing
nix fmt .for code formattingnix build .#nixosConfigurations.<monitoring-host>.config.system.build.toplevel