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feat(pageserver): observability for feature flags (#12034)

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## Problem

Part of #11813. This pull request adds misc observability improvements
for the functionality.

## Summary of changes

* Info span for the PostHog feature background loop.
* New evaluate feature flag API.
* Put the request error into the error message.
* Log when feature flag gets updated.

---------

Signed-off-by: Alex Chi Z <chi@neon.tech>
This commit is contained in:
Alex Chi Z.
2025-05-30 16:02:25 +08:00
committed by GitHub
parent 3b4d4eb535
commit af429b4a62
5 changed files with 102 additions and 24 deletions
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43
pageserver/src/http/routes.rs
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@@ -3663,6 +3663,46 @@ async fn read_tar_eof(mut reader: (impl tokio::io::AsyncRead + Unpin)) -> anyhow
Ok(())
}
async fn tenant_evaluate_feature_flag(
request: Request<Body>,
_cancel: CancellationToken,
) -> Result<Response<Body>, ApiError> {
let tenant_shard_id: TenantShardId = parse_request_param(&request, "tenant_shard_id")?;
check_permission(&request, Some(tenant_shard_id.tenant_id))?;
let flag: String = must_parse_query_param(&request, "flag")?;
let as_type: String = must_parse_query_param(&request, "as")?;
let state = get_state(&request);
async {
let tenant = state
.tenant_manager
.get_attached_tenant_shard(tenant_shard_id)?;
if as_type == "boolean" {
let result = tenant.feature_resolver.evaluate_boolean(&flag, tenant_shard_id.tenant_id);
let result = result.map(|_| true).map_err(|e| e.to_string());
json_response(StatusCode::OK, result)
} else if as_type == "multivariate" {
let result = tenant.feature_resolver.evaluate_multivariate(&flag, tenant_shard_id.tenant_id).map_err(|e| e.to_string());
json_response(StatusCode::OK, result)
} else {
// Auto infer the type of the feature flag.
let is_boolean = tenant.feature_resolver.is_feature_flag_boolean(&flag).map_err(|e| ApiError::InternalServerError(anyhow::anyhow!("{e}")))?;
if is_boolean {
let result = tenant.feature_resolver.evaluate_boolean(&flag, tenant_shard_id.tenant_id);
let result = result.map(|_| true).map_err(|e| e.to_string());
json_response(StatusCode::OK, result)
} else {
let result = tenant.feature_resolver.evaluate_multivariate(&flag, tenant_shard_id.tenant_id).map_err(|e| e.to_string());
json_response(StatusCode::OK, result)
}
}
}
.instrument(info_span!("tenant_evaluate_feature_flag", tenant_id = %tenant_shard_id.tenant_id, shard_id = %tenant_shard_id.shard_slug()))
.await
}
/// Common functionality of all the HTTP API handlers.
///
/// - Adds a tracing span to each request (by `request_span`)
@@ -4039,5 +4079,8 @@ pub fn make_router(
"/v1/tenant/:tenant_shard_id/timeline/:timeline_id/activate_post_import",
|r| api_handler(r, activate_post_import_handler),
)
.get("/v1/tenant/:tenant_shard_id/feature_flag", |r| {
api_handler(r, tenant_evaluate_feature_flag)
})
.any(handler_404))
}