docs(bf-1sba): document that shared DefaultConfig logic already exists

notes/bf-1sba.md

@@ -0,0 +1,44 @@
+# Bead bf-1sba: Extract shared DefaultConfig logic
+
+## Finding
+
+The task to extract shared DefaultConfig logic was **already complete** when this bead was claimed.
+
+### Current State
+
+The `dashboard/config` package already serves as the single source of truth for environment variable parsing:
+
+1. **`config.GetScrapeTargets()`** - parses SCRAPE_TARGETS env var (lines 61-68)
+2. **`config.GetScrapeInterval()`** - parses SCRAPE_INTERVAL env var (lines 70-74)
+3. **`config.GetScrapeTimeout()`** - parses SCRAPE_TIMEOUT env var (lines 76-80)
+4. **`config.GetListenAddr()`** - parses LISTEN_ADDR env var (lines 82-86)
+
+### Both DefaultConfig implementations use the shared source
+
+**collector.DefaultConfig()** (dashboard/collector/collector.go:40-46):
+```go
+func DefaultConfig() Config {
+	return Config{
+		Targets:  config.GetScrapeTargets(),
+		Interval: config.GetScrapeInterval(),
+		Timeout:  config.GetScrapeTimeout(),
+	}
+}
+```
+
+**api.DefaultConfig()** (dashboard/api/router.go:29-35):
+```go
+func DefaultConfig() *Config {
+	return &Config{
+		ListenAddr:     config.GetListenAddr(),
+		ScrapeInterval: config.GetScrapeInterval(),
+		ScrapeTargets:  config.GetScrapeTargets(),
+	}
+}
+```
+
+### Conclusion
+
+No code changes were needed. The SCRAPE_TARGETS and SCRAPE_INTERVAL environment variable parsing logic was already centralized in the `config` package, and both DefaultConfig implementations already reference the shared helper functions. The two cannot drift because they both call the same single source of truth.
+
+This refactoring was likely done in an earlier commit (possibly `633df37 refactor(bf-j6s): update default SCRAPE_TARGETS from mcp to devpod namespace` or related work).