Subscription History

Tell the history of a Maestro subscription — what happened each time it was triggered — using darc get-subscription-history. Each result is a subscription trigger outcome recorded by Maestro describing what happened when a subscription ran (a PR was opened/updated, there was nothing to update, the update failed, etc.).

When to Use This Skill

Use this skill when the user wants the history of a subscription's trigger outcomes — for example:

• "Show me the history of subscription <guid>"
• "Why has this subscription been failing?"
• "Did this subscription open a PR in the last week?"
• "What were the last 5 outcomes for the core-sdk subscription?"

Do not use this skill for current staleness/health (use flow-analysis or maestro-cli), for tracing a commit across repos (use flow-tracing), or for CI build failures (use ci-analysis).

Inputs

• darc installed and authenticated (see below).
• One or more filters describing the subscription of interest. The most precise filter is the subscription id (GUID). If the user gives a repo/branch instead, use --search or first resolve the id with darc get-subscriptions.

Prerequisites

darc (Dependency ARcade) manages dependency flow in the .NET ecosystem.

1. Install (or update) from any arcade-enabled repo by running the darc-init script in eng/common:

   .\eng\common\darc-init.ps1   # Windows
   

   ./eng/common/darc-init.sh    # macOS / Linux
   

   This installs the version of darc the repo expects; re-run it to update an out-of-date darc.
2. Authenticate once: darc authenticate (caches Entra ID credentials under ~/.darc/). Required to read Maestro/BAR data.

Verify with darc get-subscription-history --help. If the command is not recognized, the installed darc is too old — re-run darc-init to update it.

Workflow

Step 1: Identify the subscription

The most precise filter is the subscription id. If the user provided one, use --id <guid>. Otherwise, resolve it:

# Find the subscription id from the source/target repos
darc get-subscriptions --source-repo <source> --target-repo <target>

You can also skip resolution and pass a --search term that is matched against the subscription's source repo, target repo and target branch.

Step 2: Query the history

# Full history of one subscription (most recent first)
darc get-subscription-history --id <subscription-guid>

# Narrow to failures only
darc get-subscription-history --id <subscription-guid> --type Failure

# By repo/branch free-text search instead of id
darc get-subscription-history --search core-sdk --limit 5

# Outcomes produced by a specific build
darc get-subscription-history --build <bar-build-id>

# Restrict to a date range (ISO 8601, treated as UTC)
darc get-subscription-history --id <guid> --after "2025-01-01T00:00:00Z" --before "2025-02-01T00:00:00Z"

# Machine-readable output for scripting/jq
darc get-subscription-history --id <guid> --output-format json

All filters can be combined.

Step 3: Interpret and report

Each text outcome looks like:

2025-01-15 12:34:56Z  [Failure]  build 1234567
  Subscription: https://github.com/dotnet/runtime ==> 'https://github.com/dotnet/dotnet' ('main')
  Subscription Id: 510286a9-8cd5-47bd-a259-08d68641480a
  PR: https://github.com/dotnet/dotnet/pull/4242
  Failed to update dependencies: <details>

Summarize for the user: the timeline of outcomes (newest first), how many of each [Type], any recurring failures with their messages, and links to the PRs that were opened. Outcome types:

Options Reference

Validation

• darc get-subscription-history --help lists the verb and options → darc is current and authenticated.
• A successful run prints one or more outcome blocks (text) or a JSON array.
• "No subscription trigger outcomes found matching the specified criteria." means the filters matched nothing — broaden --search/date range or confirm the --id is correct via darc get-subscriptions.

Common Pitfalls

• GUID, not repo name, for --id. A non-GUID value errors out. Use --search for repo/branch text matching.
• Dates are UTC, ISO 8601. Use a form like "2025-01-15T12:00:00Z".
• Default --limit is 10. Increase it to see deeper history.
• Old darc. If the verb is unknown, re-run eng/common/darc-init.ps1 (or .sh) to update darc — the command was added recently.