**Related issue:** Resolves#25574
# Checklist for submitter
- [x] Changes file added for user-visible changes in `changes/`
- [x] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements), JS
inline code is prevented especially for url redirects, and untrusted
data interpolated into shell scripts/commands is validated against shell
metacharacters.
- [x] Timeouts are implemented and retries are limited to avoid infinite
loops
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
---
## Summary
- Adds a new `splunk` log plugin that sends osquery logs directly to
Splunk's HTTP Event Collector (HEC) endpoint
- Eliminates the need for middleware like AWS Firehose when using Splunk
as a log destination
- Follows the same pattern as existing log destinations (Firehose, Kafka
REST, NATS, etc.)
- Includes `insecure_skip_verify` option for environments with
self-signed TLS certs
## UI changes
Follows the same pattern as the NATS log destination PR (#36527) --
adding "Splunk" to the display name, tooltip, and TypeScript type union.
No new components, pages, or styles.
### Manage automations modal -- "Log destination: Splunk"
<img width="822" height="527" alt="image"
src="https://github.com/user-attachments/assets/2533207f-fa95-4364-8ee0-3c39cd3e8e4d"
/>
### Query details page -- "Log destination: Splunk"
<img width="1905" height="662" alt="image"
src="https://github.com/user-attachments/assets/069a5005-f95c-4562-a819-fd8bdcc349f7"
/>
### Tooltip on hover
<img width="639" height="348" alt="image"
src="https://github.com/user-attachments/assets/809a47a6-b82a-4f45-b731-77b2d2c87947"
/>
### Edit query form -- "sent to your log destination: Splunk"
<img width="451" height="814" alt="image"
src="https://github.com/user-attachments/assets/b78b9a57-1f0c-4413-8b7c-654de1fd40a2"
/>
### Save new query modal -- "sent to your log destination: Splunk"
<img width="536" height="698" alt="image"
src="https://github.com/user-attachments/assets/d0a0ab01-66fe-4d63-9190-9c5e840e456d"
/>
---
### How it works
The Splunk writer (`server/logging/splunk.go`) implements the
`fleet.JSONLogger` interface. On startup it performs a health check
against the HEC `/services/collector/health` endpoint. On each `Write()`
call, it wraps each log entry in Splunk's HEC event format (adding
`time`, `index`, `source`, `sourcetype`), batches them up to 1 MB, and
POSTs to `/services/collector/event` with the `Authorization: Splunk
<token>` header. If a batch exceeds 1 MB it flushes and starts a new
one. Events over 1 MB are dropped with a log warning. Transient errors
(HTTP 503) are retried with exponential backoff (up to 8 retries).
### Configuration
```yaml
osquery:
status_log_plugin: splunk
result_log_plugin: splunk
splunk:
url: https://splunk.example.com:8088
token: <HEC token>
index: main
source: fleet
source_type: fleet:json
insecure_skip_verify: false # set true for self-signed certs
```
Or via environment variables:
```
FLEET_OSQUERY_STATUS_LOG_PLUGIN=splunk
FLEET_OSQUERY_RESULT_LOG_PLUGIN=splunk
FLEET_SPLUNK_URL=https://splunk.example.com:8088
FLEET_SPLUNK_TOKEN=<HEC token>
FLEET_SPLUNK_INDEX=main
FLEET_SPLUNK_SOURCE=fleet
FLEET_SPLUNK_SOURCE_TYPE=fleet:json
```
### Files changed
- `server/logging/splunk.go` -- Splunk HEC log writer with batching,
retry, and health check
- `server/logging/splunk_test.go` -- 9 unit tests
- `server/logging/splunk_integration_test.go` -- 3 integration tests
against real Splunk (gated by env var)
- `server/logging/logging.go` -- Added `SplunkConfig` and `case
"splunk"` to factory
- `server/config/config.go` -- Added `SplunkConfig` struct and config
flags
- `cmd/fleet/logging.go` -- Wired Splunk config into logging builder
- `server/fleet/app.go` -- Added `SplunkConfig` type for API responses
(excludes token)
- `server/service/service_appconfig.go` -- Added `case "splunk"` to
logging plugin validation
- `frontend/interfaces/config.ts` -- Added `"splunk"` to LogDestination
type
-
`frontend/components/LogDestinationIndicator/LogDestinationIndicator.tsx`
-- Added Splunk display name and tooltip
- `docs/Configuration/fleet-server-configuration.md` -- Splunk config
documentation
- `docs/Get started/FAQ.md` -- Updated plugin list
- `articles/log-destinations.md` -- Updated Splunk section with native
HEC docs
- `changes/25574-splunk-log-destination` -- Change file
## Test plan
### Unit tests (9 tests)
- [x] `TestSplunkWrite` -- sends 3 events, verifies HEC format, auth
header, index/source/sourcetype
- [x] `TestSplunkWriteEmpty` -- empty logs don't trigger HTTP request
- [x] `TestSplunkServerError` -- HEC 403 propagates as error
- [x] `TestSplunkHealthCheckFailure` -- constructor fails on bad health
- [x] `TestSplunkRecordTooBig` -- oversized events (>1MB) are dropped,
normal events still sent
- [x] `TestSplunkSplitBatchBySize` -- logs exceeding 1MB batch limit are
split into multiple requests
- [x] `TestSplunkRetryOnServiceUnavailable` -- 503 retried with backoff,
succeeds on 3rd attempt
- [x] `TestSplunkRetryExhausted` -- after 9 attempts (1 + 8 retries)
returns error
- [x] `TestSplunkMissingConfig` -- empty URL/token returns descriptive
error
### Integration tests (3 tests, gated by `SPLUNK_INTEGRATION_TEST=1`)
- [x] `TestSplunkIntegration` -- 3 events sent via writer, queried back
from Splunk REST API
- [x] `TestSplunkIntegrationBatch` -- 100 events in one Write(), all
confirmed indexed
- [x] `TestSplunkIntegrationBadToken` -- bad token Write() returns 403
### End-to-end test (macOS ARM64, real osquery agent)
1. Started Splunk Enterprise, MySQL, Redis via Docker
2. Built Fleet server from this branch with
`--osquery_status_log_plugin=splunk`
3. Set up Fleet, enrolled a real osquery 5.23.0 agent on this MacBook
4. **83 real osquery status log events indexed in Splunk** with correct
source/sourcetype/index
5. Each event contained full osquery data (`hostIdentifier`,
`host_uuid`, `calendarTime`, `severity`, `message`, `decorations`)
### Splunk showing real osquery events from Fleet
<img width="1910" height="861" alt="image"
src="https://github.com/user-attachments/assets/192490bf-d594-4424-a3e3-a18306892873"
/>
Generated with [Claude Code](https://claude.ai/code)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added native Splunk HEC logging destination for status, result, and
audit logs.
* Updated the log destination UI to display **Splunk** with a dedicated
tooltip.
* Added Splunk HEC configuration (URL/token/index/source/source type)
including TLS verification control.
* **Bug Fixes**
* Improved log delivery with batching, retries for temporary HTTP
failures, and safeguards for oversized events.
* **Tests**
* Added unit tests and optional integration tests covering routing,
batching, retries, and error scenarios.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#40540
# Checklist for submitter
- [ ] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
- Changes present in previous PR
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Refactor**
* Switched the application logging to Go's standard slog with
context-aware logging, improving structured logs and observability
across services (status, audit, result, integrations).
* Replaced legacy logging implementations and updated runtime wiring to
propagate contextual loggers for more consistent, searchable log output.
* **Tests**
* Updated test suites to use the new slog discard/logger setup.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#40054
# Checklist for submitter
- [ ] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
- Changes included in previous PR
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Refactor**
* Consolidated and standardized internal logging infrastructure across
the application by adopting a unified logging package throughout the
codebase, replacing previous external logging dependencies.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
**Related issue:** Resolves
[34890](https://github.com/fleetdm/fleet/issues/34890)
# Checklist for submitter
- [X] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
## Testing
- [X] Added/updated automated tests
- [X] QA'd all new/changed functionality manually
## New Fleet configuration settings
Looking at other log destinations, I couldn't find anything relevant in
GitOps. Please let me know if I missed something, however.
## fleetd/orbit/Fleet Desktop
I've tested this on both Linux and MacOS.
---------
Co-authored-by: Rachael Shaw <r@rachael.wtf>
Co-authored-by: nulmete <nicoulmete1@gmail.com>
`go-kit/kit/log` was deprecated and generating warnings
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
<!-- Note that API documentation changes are now addressed by the
product design team. -->
- [x] Manual QA for all new/changed functionality
This PR implements the status/result logger functions necessary interface with a Kafka REST Proxy service.
Specifically, this is compatible with the [Confluent KAFKA Rest Proxy Service ](https://docs.confluent.io/1.0/kafka-rest/docs/intro.html).
Add a config setting to allow copying message fields and decorations into Google Pub/Sub attributes, making it possible to use these values for subscription filters.
Adds Google Cloud PubSub logging for status and results.
This also changes the Write interface for logging modules to add a context.Context (only used by pubsub currently).
- Refactor configuration for logging to use separate plugins
- Move existing filesystem logging to filesystem plugin
- Create new AWS firehose plugin
- Update documentation around logging
