Add mixin for cloudflare workers

cloudflare-workers-mixin/.lint

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+exclusions:
+    panel-title-description-rule:
+        reason: Removed panel title for visual appearance for top stats panels
+    template-datasource-rule:
+        reason: Better for CLoudflare users to use trace and logs datasource
+    target-logql-auto-rule:
+        reason: panel 'traces table' is using logql query check

cloudflare-workers-mixin/Makefile

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+include ../Makefile_mixin

cloudflare-workers-mixin/README.md

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+# Cloudflare Workers Mixin
+
+The Cloudflare Workers mixin is a set of configurable Grafana dashboards for monitoring Cloudflare Workers using structured logs from Cloudflare Workers Observability.
+
+The Cloudflare Workers mixin contains the following dashboard:
+
+- Cloudflare Workers
+
+## Cloudflare Workers Dashboard Overview
+The Cloudflare Workers dashboard provides comprehensive observability into your serverless functions deployed on Cloudflare's edge network. 
+It leverages the rich structured metadata from Cloudflare Workers logs to deliver insights across multiple dimensions:
+
+### Key Metrics & Statistics
+- Request Volume: Total requests, request rate (req/sec), and unique request tracking via Ray IDs
+Log Severity: Breakdown of info, warning, and error logs with color-coded indicators
+Geographic Distribution: Unique countries, colos (edge locations), and FaaS execution regions
+- Client Insights: Browser types, device vendors, and unique client diversity metrics
+
+### Request Analytics
+- HTTP Methods: Distribution and trends of GET, POST, and other HTTP verbs
+- URL Paths: Endpoint-level request analysis showing which routes receive traffic
+- Network Protocols: HTTPS vs HTTP usage monitoring
+- Request Triggers: FaaS trigger type analysis (http, scheduled, etc.)
+
+### Geographic & Network Intelligence
+- World Map: Interactive geomap showing request distribution by country
+- Edge Location Analysis: Cloudflare colo distribution with heatmaps and charts
+- Continental Distribution: Traffic breakdown by continent (AS, EU, NA, etc.)
+- Timezone Analysis: Request patterns across different time zones
+- ISP Tracking: Autonomous System Number (ASN) distribution for network analysis
+- City & Region: State/province and city-level geographic breakdown
+
+### Client & Browser Analytics
+- Browser Distribution: Usage across Chrome, Firefox, Safari, Edge, etc.
+- Browser Versions: Detailed version tracking for compatibility monitoring
+- Rendering Engines: Blink, Gecko, WebKit distribution
+- Operating Systems: macOS, Windows, Linux, mobile OS breakdown
+- Device Vendors: Apple, Samsung, and other device manufacturer tracking
+- Language Preferences: Accept-Language header analysis for internationalization insights
+- Performance & Operations
+- Log Volume Trends: Time series showing log patterns by severity level
+- Request Rate Analysis: Temporal patterns by method, path, region, and colo
+- Regional Performance: FaaS execution region distribution and rates
+- Request Heatmaps: Time-based patterns across edge locations
+
+## Tools
+To use them, you need to have `mixtool` and `jsonnetfmt` installed. If you have a working Go development environment, it's easiest to run the following:
+
+```bash
+$ go get github.com/monitoring-mixins/mixtool/cmd/mixtool
+$ go get github.com/google/go-jsonnet/cmd/jsonnetfmt
+```
+
+You can then build a directory `dashboard_out` with the JSON dashboard files for Grafana:
+
+```bash
+$ make build
+```
+
+For more advanced uses of mixins, see [Prometheus Monitoring Mixins docs](https://github.com/monitoring-mixins/docs).