feat(triggers): Smart Triggers JSON prototype - #953
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andrewazores merged 17 commits intoAug 19, 2026
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Josh-Matsuoka
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August 11, 2026 14:30
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This repository does not receive automatic reviews because it has fewer than 10 stars. ⚙️ Run configurationConfiguration used: Organization UI Review profile: CHILL Plan: Pro Plus Run ID: 📝 WalkthroughSummary by CodeRabbit
WalkthroughThe change replaces command-line smart-trigger input with structured JSON requests and files. It adds request modeling, validation, evaluator wiring, remote POST handling, updated tests, and documentation. ChangesSmart Triggers JSON management
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to The JSON smart-trigger endpoint can create immediate triggers when duration is omitted, stop trigger evaluation on invalid input, lose sub-second duration precision, and expose identifiers contrary to the documented API flow. These correctness and compatibility issues should be fixed or explicitly accepted before merging. Sequence Diagram(s)sequenceDiagram
participant Client
participant SmartTriggersContext
participant TriggerEvaluator
participant TriggerParser
Client->>SmartTriggersContext: POST SmartTriggerReq array
SmartTriggersContext->>TriggerEvaluator: append requests
TriggerEvaluator->>TriggerParser: parse each request
TriggerEvaluator-->>SmartTriggersContext: registration results
SmartTriggersContext-->>Client: return trigger IDs
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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I think this can be skipped and the breaking change just directly implemented without a config flag - it'll just need the corresponding adjustment on the Cryostat server side ready to go so both can be merged together. Once that's ready and remote management by API (using JSON serialization) is fixed up, the #817 pieces about removing the command line argument handling can also be done in this PR. |
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Actionable comments posted: 2
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Inline comments:
In `@src/main/java/io/cryostat/agent/remote/SmartTriggersBetaContext.java`:
- Around line 70-79: Update the GET response flow in SmartTriggersBetaContext to
serialize the constructed response DTO list instead of
evaluator.getDefinitions(). Extend the response DTO to include each trigger’s
generated UUID and JSON fields for condition, duration, and recording template,
then populate it from the existing returnVal construction; never serialize
SmartTrigger domain objects directly.
In `@src/main/java/io/cryostat/agent/triggers/TriggerEvaluator.java`:
- Around line 97-99: Update append(SmartTrigger) to register the supplied
structured trigger directly instead of passing trigger.getExpression() through
append(String) or legacy parsing. Preserve the same stop/start lifecycle used by
trigger registration, and add a regression test verifying valid SmartTrigger
POST requests register successfully.
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📒 Files selected for processing (8)
src/main/java/io/cryostat/agent/ConfigModule.javasrc/main/java/io/cryostat/agent/remote/RemoteModule.javasrc/main/java/io/cryostat/agent/remote/SmartTriggersBetaContext.javasrc/main/java/io/cryostat/agent/triggers/SmartTriggerReq.javasrc/main/java/io/cryostat/agent/triggers/TriggerEvaluator.javasrc/main/java/io/cryostat/agent/triggers/TriggerModule.javasrc/main/java/io/cryostat/agent/triggers/TriggerParser.javasrc/test/java/io/cryostat/agent/triggers/TriggerParserTest.java
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Actionable comments posted: 5
🤖 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 `@src/main/java/io/cryostat/agent/Agent.java`:
- Line 276: Resolve the --smartTrigger contract in Agent startup: either remove
the option and its serialization through AgentArgs, or translate its values into
the supported JSON trigger source before client.triggerEvaluator().start().
Ensure the selected approach does not silently accept --smartTrigger without
registering a trigger, and update the related Agent/AgentArgs handling
consistently.
In `@src/main/java/io/cryostat/agent/remote/SmartTriggersContext.java`:
- Around line 71-88: Update the POST handler in SmartTriggersContext to use the
/smart-triggers-beta/ route instead of the legacy /smart-triggers/ path, and
enforce the beta-format configuration gate before parsing requests as
SmartTriggerReq. Preserve the legacy endpoint and its existing request contract
for clients not using the beta route.
- Around line 71-88: Update the POST handling in SmartTriggersContext to
deserialize the request body directly into SmartTriggerReq using the request
InputStream; remove the intermediate mapper.readTree(body).asText() conversion
while preserving the existing trigger evaluation and response behavior.
In `@src/main/java/io/cryostat/agent/triggers/TriggerEvaluator.java`:
- Around line 140-142: Separate initial definition loading from scheduled-task
startup in TriggerEvaluator.start: load parser.parseFromFiles() and configured
definitions only during application initialization. Update append and remove to
invoke a new method that restarts the evaluation task without re-registering
persistent sources, preventing deleted definitions from being recreated.
In `@src/main/java/io/cryostat/agent/triggers/TriggerParser.java`:
- Around line 149-154: Update the trigger parsing loop around isValid to guard
r, r.getCondition(), and r.getRecordingTemplate() against null before
validation; skip only that malformed entry and continue processing remaining
triggers, while preserving the existing validation behavior for non-null entries
and preventing the outer catch from discarding the entire result.
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📒 Files selected for processing (9)
src/main/java/io/cryostat/agent/Agent.javasrc/main/java/io/cryostat/agent/AgentArgs.javasrc/main/java/io/cryostat/agent/remote/SmartTriggersContext.javasrc/main/java/io/cryostat/agent/triggers/SmartTriggerReq.javasrc/main/java/io/cryostat/agent/triggers/TriggerEvaluator.javasrc/main/java/io/cryostat/agent/triggers/TriggerModule.javasrc/main/java/io/cryostat/agent/triggers/TriggerParser.javasrc/test/java/io/cryostat/agent/AgentArgsTest.javasrc/test/java/io/cryostat/agent/triggers/TriggerParserTest.java
💤 Files with no reviewable changes (1)
- src/main/java/io/cryostat/agent/triggers/TriggerModule.java
🚧 Files skipped from review as they are similar to previous changes (1)
- src/test/java/io/cryostat/agent/triggers/TriggerParserTest.java
This was referenced Aug 12, 2026
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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 `@README.md`:
- Around line 140-148: The Smart Trigger documentation uses invalid JSON
examples with unquoted property names. Update README.md lines 140-148 to quote
every property name while preserving those quotes through shell parsing, and
update README.md lines 94-97 to quote property names and represent placeholders
as JSON strings; both sites require direct documentation changes.
- Line 119: Remove the legacy Smart Trigger syntax line
“[ThreadCount>20;TargetDuration>duration("10s")]~Continuous” from the README
example, leaving the following structured SmartTriggerReq-compatible JSON
example intact.
In `@src/main/java/io/cryostat/agent/AgentArgs.java`:
- Around line 38-44: Apply the CRYOSTAT_AGENT_SMART_TRIGGER_BETA_FORMAT gate in
the attach-argument parsing flow before constructing AgentArgs, preserving the
legacy agent.smartTriggers value when the flag is disabled. Update the relevant
Attacher parsing/serialization logic rather than changing AgentArgs
constructors, and retain the existing beta-format behavior when the flag is
enabled.
In `@src/main/java/io/cryostat/agent/triggers/TriggerEvaluator.java`:
- Line 118: In TriggerEvaluator, serialize the complete lifecycle of start,
append, remove, and refresh with one shared lock, including each refresh
invocation from append/remove. Make remove’s map update and task
stop/replacement atomic under that lock, and protect the task field explicitly
rather than relying on ConcurrentHashMap, so concurrent mutations cannot leave
an unmanaged evaluation task running.
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📒 Files selected for processing (7)
README.mdsrc/main/java/io/cryostat/agent/Agent.javasrc/main/java/io/cryostat/agent/AgentArgs.javasrc/main/java/io/cryostat/agent/Attacher.javasrc/main/java/io/cryostat/agent/remote/SmartTriggersContext.javasrc/main/java/io/cryostat/agent/triggers/TriggerEvaluator.javasrc/main/java/io/cryostat/agent/triggers/TriggerParser.java
💤 Files with no reviewable changes (1)
- src/main/java/io/cryostat/agent/Agent.java
🚧 Files skipped from review as they are similar to previous changes (2)
- src/main/java/io/cryostat/agent/remote/SmartTriggersContext.java
- src/main/java/io/cryostat/agent/triggers/TriggerParser.java
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dependent issues check failing due to server issues:
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Actionable comments posted: 4
🤖 Prompt for all review comments with AI agents
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@src/main/java/io/cryostat/agent/remote/SmartTriggersContext.java`:
- Around line 70-73: Update the POST response handling in SmartTriggersContext
so evaluator.append(reqs) is still invoked but its generated UUIDs are not
serialized in the response; return only the success response body/status, while
preserving GET as the operation that exposes UUIDs.
In `@src/main/java/io/cryostat/agent/triggers/SmartTriggerReq.java`:
- Around line 23-46: Update SmartTriggerReq and TriggerParser.isValid to
distinguish an omitted duration from an explicitly provided value, using
presence tracking or a nullable duration, and reject missing duration before
trigger construction. Preserve valid duration handling and add coverage for
requests that omit the duration field.
In `@src/main/java/io/cryostat/agent/triggers/TriggerEvaluator.java`:
- Around line 99-107: The trigger-evaluation loop must handle null results from
parser.parse(req) before registerTrigger or trigger.getExpression is called.
Skip invalid requests or reject the batch with an explicit result, ensure
refresh still occurs according to the existing lifecycle, and never pass null to
registerTrigger.
In `@src/main/java/io/cryostat/agent/triggers/TriggerParser.java`:
- Around line 184-190: Update constructDurationExprFromRequest to preserve
millisecond precision by emitting the requested duration with an “ms” suffix
instead of converting it to whole seconds. Keep the zero-duration empty
expression behavior unchanged, and add parser tests covering 1, 999, and 1500
milliseconds.
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📒 Files selected for processing (8)
README.mdsrc/main/java/io/cryostat/agent/ConfigModule.javasrc/main/java/io/cryostat/agent/remote/SmartTriggersContext.javasrc/main/java/io/cryostat/agent/triggers/SmartTriggerReq.javasrc/main/java/io/cryostat/agent/triggers/TriggerEvaluator.javasrc/main/java/io/cryostat/agent/triggers/TriggerModule.javasrc/main/java/io/cryostat/agent/triggers/TriggerParser.javasrc/test/java/io/cryostat/agent/triggers/TriggerParserTest.java
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Contributor
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On second thought it is better to simplify the targetDuration handling of the SmartTrigger structure. This lets us remove the expression generation entirely, the only relevant one is the duration expression which can be created by the SmartTrigger object instead. CI checks expected to fail due to libcryostat changes |
Member
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Not sure if the root cause is on the Agent side, or server/frontend, but when I try to create a trigger now via UI I get an HTTP 502 response and this appears in the Agent's logs: |
Contributor
Author
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I can't reproduce that, are you sure you've updated and built all of the PRs? With everything updated and built together I'm seeing normal behavior from the UI. 
|
Member
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Hmm, let me try again. I did try to rebuild everything locally but maybe I missed a step, or maybe one of Cryostat or the Agent used an outdated -core. |
andrewazores
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Fixes: #817
Depends on: cryostatio/cryostat-core#747 cryostatio/cryostat#1736 cryostatio/cryostat-web#2411
Adds a prototype implementation of smart triggers as a json representation, for example:
{ condition : ProcessCpuLoad>0.1, duration: 30s, template: profiling }
This is easily extensible later to support e.g. an operation parameter specifying what kind of action to take when the trigger conditions are met. This fully abstracts away the CEL implementation from the user, all they need to supply is the conditions, durations, and templates. We can construct any needed expressions from there.
UUIDs are not included in the request representation, as they're generated internally rather than by the user. This means to make use of the delete endpoint the user will still need to call GET first to retrieve the representation with the IDs listed.
Since this is a breaking change I've contained it for now to its' own endpoint /smart-triggers-beta/ and config option (CRYOSTAT_AGENT_SMART_TRIGGER_BETA_FORMAT).
Opening as draft while tests are added