Added some production-default recommendations by Thorium · Pull Request #1232 · CompositionalIT/farmer

Thorium · 2025-11-04T19:18:10Z

I did ask from Claude Sonnet what is in FsCDK (AWS) that Farmer (Azure) is missing, and it came up with this PR:

Farmer lacks best-practice safe settings for production ready environments.
So this build adds those

Farmer already has some opinionated approaches, but it doesn't really go into "production-environment-focus" (cost-efficiency, logging, hardened security, and so on).

Be suspicious about agents... Meanwhile this PR can be ready for merge, I'm not actually expecting that.
Rather the question is, would we want to take Farmer into this direction or no?

ninjarobot · 2025-12-05T12:35:14Z

I had copilot do a few PR's, so no problem with that, but every change still needs to follow the requirements in the PR template. Two big areas that we have to watch for:

Testing against a live Azure subscription to make sure the changes really work - this falls on the human to do (or you can give an agent access to your own subscription for testing).
Testing for backwards compatibility. This PR didn't do it, but some PR's go and change all the breaking tests, even when the breakage is there to catch compatibility issues.

ninjarobot

These changes look good from the standpoint of functionality and compatibility. All the documentation is definitely appreciated as well.

Thorium · 2025-12-05T12:38:40Z

This was rather question (with code attached) of do we want to take this direction, rather than a PR intended to be merged. We can close the PR but what you think about the idea?

Thorium · 2025-12-05T12:40:32Z

Reopened: Actually, as documentation improvement, this might be valuable.

ninjarobot · 2025-12-05T12:50:45Z

I'm good with the direction and I've been going through issues to see which ones are defined clearly enough to give to AI. It would definitely really help to tell it to focus on a feature at a time, though. Maintaining quality when there are huge change sets coming in from AI is really difficult. Breaking changes are incredibly detrimental to OSS projects - the last thing we want is for users to be concerned about taking upgrades.

ninjarobot · 2025-12-05T12:54:49Z

I had to do this for Copilot so it would fix up code to prevent fantomas failures. Is there something that could be added to the repo to make it easier for Claude as well?

Thorium · 2025-12-05T13:28:54Z

Generally working with all agents, you add AGENTS.md as general instructions and patterns how they should do things. You can ask e.g. Claude to generate you a template and then modify it by your needs.

Copilot

Pull request overview

This PR introduces “production default” helper keywords and guidance aimed at making Azure Functions and Application Insights configurations safer/more cost-aware by default (HTTPS enforcement, scale caps, and sampling presets), along with tests and documentation/examples.

Changes:

Added production_defaults to the Functions builder (HTTPS-only, AlwaysOn for non-Consumption, and a Consumption scale cap default).
Added production_sampling / development_sampling to the App Insights builder, plus sampling validation tests.
Added new production guidance documentation and a “production-ready” example script.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 11 comments.

Show a summary per file

File	Description
src/Tests/Functions.fs	Adds tests covering `production_defaults` behavior and override behavior.
src/Tests/AppInsights.fs	Adds tests for sampling presets and sampling percentage validation.
src/Farmer/Builders/Builders.Functions.fs	Implements `production_defaults` and adds a runtime warning when Consumption has no scale limit.
src/Farmer/Builders/Builders.AppInsights.fs	Implements sampling presets and adds a runtime warning when sampling is 100%.
examples/production-ready-example.fsx	New script demonstrating intended “production-ready” usage (currently references missing APIs).
docs/content/deployment-guidance/production-best-practices.md	New best-practices guide for production deployments.
docs/content/api-overview/resources/functions.md	Documents the new `production_defaults` keyword and provides examples.
docs/content/api-overview/resources/app-insights.md	Documents the new sampling keywords and provides examples/notes.

Copilot · 2026-04-22T13:10:57Z

+// Production: 20% sampling (keeps all errors, samples successes)
+let prodInsights = appInsights {
+    name "high-traffic-api-insights"
+    production_sampling
+}


The example/commentary here says "keeps all errors" with production sampling. Please avoid an absolute guarantee about error retention under sampling (failed requests can still be sampled depending on telemetry type/sampling mode); reword more cautiously and link to the Azure sampling docs.

Copilot · 2026-04-22T13:10:58Z

+open Farmer
+open Farmer.Builders
+open Farmer.ProductionValidation
+open Farmer.ProductionDefaults
+


This example script imports Farmer.ProductionValidation and Farmer.ProductionDefaults, but those modules don't exist anywhere under src/ in this branch (search found no matches). As written, the script will not compile/run; either add the missing modules to the library, or remove/replace these open statements with existing APIs.

Copilot · 2026-04-22T13:10:59Z

+|> Functions.validateAndWarn  // Show validation results
+


The example calls Functions.validateAndWarn here, but no validateAndWarn exists under src/ (search returned no matches). Either implement this helper and expose it from a real module, or change the example to use existing APIs so it runs as-is.

Copilot · 2026-04-22T13:11:01Z

+### High Sampling Warning
+```fsharp
+let fullSampling = appInsights {
+    name "my-ai"
+    sampling_percentage 100
+}
+// Warning: [my-ai] App Insights sampling at 100%. For high-traffic production apps, consider 'production_sampling'
+```


The "Helpful Warnings" section states Farmer will warn about sampling=100% "for production workloads", but the implementation warns unconditionally when sampling is 100% (including the default). Please align the docs with the actual behavior, or switch to an explicit/opt-in validation API where callers decide when to emit warnings.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Added some production-default recommendations

8339db7

ninjarobot approved these changes Dec 5, 2025

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ninjarobot assigned Copilot Dec 5, 2025

Thorium closed this Dec 5, 2025

Thorium reopened this Dec 5, 2025

ninjarobot unassigned Copilot Dec 5, 2025

Fantomas formatting

4d9c869

ninjarobot requested a review from Copilot April 22, 2026 13:05

Copilot started reviewing on behalf of ninjarobot April 22, 2026 13:05 View session

Copilot AI reviewed Apr 22, 2026

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Thorium and others added 6 commits April 23, 2026 15:07

Update src/Farmer/Builders/Builders.Functions.fs

a342749

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update src/Farmer/Builders/Builders.AppInsights.fs

857eb7d

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update docs/content/api-overview/resources/app-insights.md

d95409c

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update src/Farmer/Builders/Builders.AppInsights.fs

ec99a0f

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update docs/content/deployment-guidance/production-best-practices.md

242e0cb

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Update docs/content/deployment-guidance/production-best-practices.md

4f4a31d

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

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Thorium commented Nov 4, 2025

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