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Feat/docker cpu monitoring #2302

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mfreeman451 merged 22 commits from refs/pull/2302/head into main

2025-10-11 04:59:41 +00:00

mfreeman451 commented

2025-10-10 05:55:21 +00:00

(Migrated from github.com)

Owner

Imported from GitHub pull request.

Original GitHub pull request: #1736
Original author: @mfreeman451
Original URL: https://github.com/carverauto/serviceradar/pull/1736
Original created: 2025-10-10T05:55:21Z
Original updated: 2025-10-11T04:59:50Z
Original head: carverauto/serviceradar:feat/docker_cpu_monitoring
Original base: main
Original merged: 2025-10-11T04:59:41Z by @mfreeman451

PR Type

Enhancement

Description

Add CPU frequency monitoring to sysmon metrics
Create dedicated sysmon-vm gRPC checker service
Implement CPU frequency collector using sysfs/procfs
Extend database schema with frequency_hz column

Diagram Walkthrough

flowchart LR
  A["cpufreq collector"] --> B["sysmon-vm service"]
  B --> C["gRPC AgentService"]
  C --> D["agent poller"]
  D --> E["core metrics storage"]
  E --> F["cpu_metrics table"]
  F --> G["API endpoints"]

File Walkthrough

Relevant files

Enhancement

11 files

main.go `New sysmon-vm checker service main entry point`	+78/-0
service.go `gRPC service implementation with CPU metrics`	+185/-0
sysmon.go `Add frequency_hz to CPU metrics API`	+5/-2
metrics.go `Include frequency data in sysmon processing`	+3/-0
collector.go `CPU frequency collector using sysfs/procfs`	+118/-0
metrics.go `Update database queries for frequency column`	+5/-5
sysmon.go `Add frequency field to metrics storage`	+1/-0
metrics.go `Add FrequencyHz field to CPUMetric model`	+2/-0
00000000000001_consolidated_serviceradar_schema.up.sql `Add frequency_hz column to base schema`	+1/-0
00000000000006_cpu_frequency_column.down.sql `Migration rollback for frequency column`	+2/-0
00000000000006_cpu_frequency_column.up.sql `Migration to add frequency column`	+2/-0

Configuration changes

3 files

registry.go `Register sysmon-vm service in agent registry`	+2/-0
config.go `Configuration structure for sysmon-vm checker`	+45/-0
sysmon-vm.json.example `Example configuration file for sysmon-vm`	+9/-0

Formatting

1 files

agent_poller.go
Code formatting improvements in poller +22/-22

Documentation

2 files

README.md `Documentation for sysmon-vm checker deployment`	+49/-0
cpu_plan.md `Implementation plan and operational checklist`	+154/-0

Dependencies

2 files

go.mod `Add gopsutil dependency for system metrics`	+8/-0
go.sum `Update dependency checksums for gopsutil`	+23/-0

Imported from GitHub pull request. Original GitHub pull request: #1736 Original author: @mfreeman451 Original URL: https://github.com/carverauto/serviceradar/pull/1736 Original created: 2025-10-10T05:55:21Z Original updated: 2025-10-11T04:59:50Z Original head: carverauto/serviceradar:feat/docker_cpu_monitoring Original base: main Original merged: 2025-10-11T04:59:41Z by @mfreeman451 --- ### **PR Type** Enhancement ___ ### **Description** - Add CPU frequency monitoring to sysmon metrics - Create dedicated `sysmon-vm` gRPC checker service - Implement CPU frequency collector using sysfs/procfs - Extend database schema with `frequency_hz` column ___ ### Diagram Walkthrough ```mermaid flowchart LR A["cpufreq collector"] --> B["sysmon-vm service"] B --> C["gRPC AgentService"] C --> D["agent poller"] D --> E["core metrics storage"] E --> F["cpu_metrics table"] F --> G["API endpoints"] ``` <details> <summary><h3> File Walkthrough</h3></summary> <table><thead><tr><th></th><th align="left">Relevant files</th></tr></thead><tbody><tr><td><strong>Enhancement</strong></td><td><details><summary>11 files</summary><table> <tr> <td><strong>main.go</strong><dd><code>New sysmon-vm checker service main entry point</code>                      </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-b1ab49590901666d7536778838bbf3eda1cac7c33257e8e89cb3ab74df8ae376">+78/-0</a>    </td> </tr> <tr> <td><strong>service.go</strong><dd><code>gRPC service implementation with CPU metrics</code>                          </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-02211c03421188a7a92d44ce12a4ee8d9f09b224d7176b8713fcefac759ee989">+185/-0</a>  </td> </tr> <tr> <td><strong>sysmon.go</strong><dd><code>Add frequency_hz to CPU metrics API</code>                                            </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-4879e8b367ee55413c6cb006f23bb912261df5310c640d3af352033cf97ffc84">+5/-2</a>      </td> </tr> <tr> <td><strong>metrics.go</strong><dd><code>Include frequency data in sysmon processing</code>                            </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-6d98e853ce17576c088e77956ae4ecfa8078019e0bff107a79d8d1d6ed2443ad">+3/-0</a>      </td> </tr> <tr> <td><strong>collector.go</strong><dd><code>CPU frequency collector using sysfs/procfs</code>                              </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-35e6ecb698e97eb56fac27c2c42a1cb402cb477e408fc5bf08d7a7b233241b55">+118/-0</a>  </td> </tr> <tr> <td><strong>metrics.go</strong><dd><code>Update database queries for frequency column</code>                          </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-2cf937853ac86eb9a879bd370cbe22b835ee0c48be6771b48b0276d93cc2ae93">+5/-5</a>      </td> </tr> <tr> <td><strong>sysmon.go</strong><dd><code>Add frequency field to metrics storage</code>                                      </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-aa961b7342ce9c95d32ab147ed3e44f9702e6d7a649ef7528c48288a4cd6049d">+1/-0</a>      </td> </tr> <tr> <td><strong>metrics.go</strong><dd><code>Add FrequencyHz field to CPUMetric model</code>                                  </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-1c5e2a501867b2fe257cc13a4ec0a49edf5b97f7c8c1c511e0787803fa692314">+2/-0</a>      </td> </tr> <tr> <td><strong>00000000000001_consolidated_serviceradar_schema.up.sql</strong><dd><code>Add frequency_hz column to base schema</code>                                      </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-1e05de747238f2112bb2230aac8db388e4c80eebe84c071eb78e035d64e67eb6">+1/-0</a>      </td> </tr> <tr> <td><strong>00000000000006_cpu_frequency_column.down.sql</strong><dd><code>Migration rollback for frequency column</code>                                    </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-5f623c51a28d1cc3d72a0da50871c503daddb44859fdd990c3f3f6d4f15870cb">+2/-0</a>      </td> </tr> <tr> <td><strong>00000000000006_cpu_frequency_column.up.sql</strong><dd><code>Migration to add frequency column</code>                                                </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-29254199b4448c6d86227ec8ad74ff5d3c5839bff9a065a12cfe181501cac20a">+2/-0</a>      </td> </tr> </table></details></td></tr><tr><td><strong>Configuration changes</strong></td><td><details><summary>3 files</summary><table> <tr> <td><strong>registry.go</strong><dd><code>Register sysmon-vm service in agent registry</code>                          </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-9ea3b939dfe069a8743ce6d9b53e9601b8dd4cc680a249c1994a95a9c119102f">+2/-0</a>      </td> </tr> <tr> <td><strong>config.go</strong><dd><code>Configuration structure for sysmon-vm checker</code>                        </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-759162c1c3008b74e820561e4a8d6ff2802a072e056f91ee7f52089702a2bce2">+45/-0</a>    </td> </tr> <tr> <td><strong>sysmon-vm.json.example</strong><dd><code>Example configuration file for sysmon-vm</code>                                  </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-48004400818e27aa9658afe57b85efabc0cbcfdd1914b1699a40f29856236dac">+9/-0</a>      </td> </tr> </table></details></td></tr><tr><td><strong>Formatting</strong></td><td><details><summary>1 files</summary><table> <tr> <td><strong>agent_poller.go</strong><dd><code>Code formatting improvements in poller</code>                                      </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-7cdaae416a1e7b5d39ad75f138c49fa0aca12fc38e8ab0b26bb59c64446da15c">+22/-22</a>  </td> </tr> </table></details></td></tr><tr><td><strong>Documentation</strong></td><td><details><summary>2 files</summary><table> <tr> <td><strong>README.md</strong><dd><code>Documentation for sysmon-vm checker deployment</code>                      </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-f72d7c40673ad7eb78ef313ce5aa05442176de542f531a96ca5776156ac41d4b">+49/-0</a>    </td> </tr> <tr> <td><strong>cpu_plan.md</strong><dd><code>Implementation plan and operational checklist</code>                        </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-c0dc94ab36dba7fcd11ecff636aa9814b5a34f935329473e01dc648a84ea8cb1">+154/-0</a>  </td> </tr> </table></details></td></tr><tr><td><strong>Dependencies</strong></td><td><details><summary>2 files</summary><table> <tr> <td><strong>go.mod</strong><dd><code>Add gopsutil dependency for system metrics</code>                              </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-33ef32bf6c23acb95f5902d7097b7a1d5128ca061167ec0716715b0b9eeaa5f6">+8/-0</a>      </td> </tr> <tr> <td><strong>go.sum</strong><dd><code>Update dependency checksums for gopsutil</code>                                  </dd></td> <td><a href="https://github.com/carverauto/serviceradar/pull/1736/files#diff-3295df7234525439d778f1b282d146a4f1ff6b415248aaac074e8042d9f42d63">+23/-0</a>    </td> </tr> </table></details></td></tr></tr></tbody></table> </details> ___

qodo-code-review[bot] commented

2025-10-10 05:56:03 +00:00

(Migrated from github.com)

Author

Owner

Imported GitHub PR comment.

Original author: @qodo-code-review[bot]
Original URL: https://github.com/carverauto/serviceradar/pull/1736#issuecomment-3388390549
Original created: 2025-10-10T05:56:03Z

PR Compliance Guide 🔍

Below is a summary of compliance checks for this PR:

Security Compliance
⚪	External network dial Description: The function `localIP()` dials an external UDP address ("8.8.8.8:80") to infer the local IP, which can leak network metadata and may fail or hang in restricted environments; consider using local interface inspection instead. service.go [172-185] Referred Code `func localIP() string { conn, err := net.Dial("udp", "8.8.8.8:80") if err != nil { return "unknown" } defer conn.Close() localAddr, ok := conn.LocalAddr().(*net.UDPAddr) if !ok { return "unknown" } return localAddr.IP.String() }`
	SQL injection Description: Building SQL with fmt.Sprintf that interpolates `device_id` and timestamps directly risks SQL injection if any value is untrusted; use parameterized queries instead. sysmon.go [394-402] Referred Code func (s *APIServer) getCPUMetricsForDevice( ctx context.Context, _ db.SysmonMetricsProvider, deviceID string, start, end time.Time) (interface{}, error) { // Query cpu_metrics table directly for per-core data by device_id query := fmt.Sprintf(` SELECT timestamp, agent_id, host_id, core_id, usage_percent, frequency_hz FROM table(cpu_metrics) WHERE device_id = '%s' AND timestamp BETWEEN '%s' AND '%s' ORDER BY timestamp DESC, core_id ASC`, deviceID, start.Format(time.RFC3339), end.Format(time.RFC3339))
	Path traversal Description: Reading from `/sys/devices/system/cpu/.../scaling_cur_freq` without constraining `core` to expected bounds could allow path probing if core count is spoofed upstream; validate indices strictly against `cpu.Counts` and construct paths defensively. collector.go [98-117] Referred Code `func readSysfs(core int) (float64, bool) { path := filepath.Join(sysfsCpufreqPath, fmt.Sprintf("cpu%d/cpufreq/scaling_cur_freq", core)) data, err := os.ReadFile(path) if err != nil { return 0, false } raw := strings.TrimSpace(string(data)) if raw == "" { return 0, false } // scaling_cur_freq is reported in kHz. val, err := strconv.ParseFloat(raw, 64) if err != nil { return 0, false } return val * 1_000, true`
Ticket Compliance
⚪	🎫 No ticket provided Create ticket/issue
Codebase Duplication Compliance
⚪	Codebase context is not defined Follow the guide to enable codebase context checks.
Custom Compliance
⚪	No custom compliance provided Follow the guide to enable custom compliance check.
Update

Compliance status legend

🟢 - Fully Compliant
🟡 - Partial Compliant
🔴 - Not Compliant
⚪ - Requires Further Human Verification
🏷️ - Compliance label

Imported GitHub PR comment. Original author: @qodo-code-review[bot] Original URL: https://github.com/carverauto/serviceradar/pull/1736#issuecomment-3388390549 Original created: 2025-10-10T05:56:03Z --- ## PR Compliance Guide 🔍  Below is a summary of compliance checks for this PR:<br> <table><tbody><tr><td colspan='2'><strong>Security Compliance</strong></td></tr> <tr><td rowspan=3>⚪</td> <td><details><summary><strong>External network dial </strong></summary><br> <b>Description:</b> The function <code>localIP()</code> dials an external UDP address ("8.8.8.8:80") to infer the local IP, <br>which can leak network metadata and may fail or hang in restricted environments; consider <br>using local interface inspection instead.<br> <strong><a href='https://github.com/carverauto/serviceradar/pull/1736/files#diff-02211c03421188a7a92d44ce12a4ee8d9f09b224d7176b8713fcefac759ee989R172-R185'>service.go [172-185]</a></strong><br> <details open><summary>Referred Code</summary> ```go func localIP() string { conn, err := net.Dial("udp", "8.8.8.8:80") if err != nil { return "unknown" } defer conn.Close() localAddr, ok := conn.LocalAddr().(*net.UDPAddr) if !ok { return "unknown" } return localAddr.IP.String() } ``` </details></details></td></tr> <tr><td><details><summary><strong>SQL injection </strong></summary><br> <b>Description:</b> Building SQL with fmt.Sprintf that interpolates <code>device_id</code> and timestamps directly risks <br>SQL injection if any value is untrusted; use parameterized queries instead.<br> <strong><a href='https://github.com/carverauto/serviceradar/pull/1736/files#diff-4879e8b367ee55413c6cb006f23bb912261df5310c640d3af352033cf97ffc84R394-R402'>sysmon.go [394-402]</a></strong><br> <details open><summary>Referred Code</summary> ```go func (s *APIServer) getCPUMetricsForDevice( ctx context.Context, _ db.SysmonMetricsProvider, deviceID string, start, end time.Time) (interface{}, error) { // Query cpu_metrics table directly for per-core data by device_id query := fmt.Sprintf(` SELECT timestamp, agent_id, host_id, core_id, usage_percent, frequency_hz FROM table(cpu_metrics) WHERE device_id = '%s' AND timestamp BETWEEN '%s' AND '%s' ORDER BY timestamp DESC, core_id ASC`, deviceID, start.Format(time.RFC3339), end.Format(time.RFC3339)) ``` </details></details></td></tr> <tr><td><details><summary><strong>Path traversal </strong></summary><br> <b>Description:</b> Reading from <code>/sys/devices/system/cpu/.../scaling_cur_freq</code> without constraining <code>core</code> to <br>expected bounds could allow path probing if core count is spoofed upstream; validate <br>indices strictly against <code>cpu.Counts</code> and construct paths defensively.<br> <strong><a href='https://github.com/carverauto/serviceradar/pull/1736/files#diff-35e6ecb698e97eb56fac27c2c42a1cb402cb477e408fc5bf08d7a7b233241b55R98-R117'>collector.go [98-117]</a></strong><br> <details open><summary>Referred Code</summary> ```go func readSysfs(core int) (float64, bool) { path := filepath.Join(sysfsCpufreqPath, fmt.Sprintf("cpu%d/cpufreq/scaling_cur_freq", core)) data, err := os.ReadFile(path) if err != nil { return 0, false } raw := strings.TrimSpace(string(data)) if raw == "" { return 0, false } // scaling_cur_freq is reported in kHz. val, err := strconv.ParseFloat(raw, 64) if err != nil { return 0, false } return val * 1_000, true ``` </details></details></td></tr> <tr><td colspan='2'><strong>Ticket Compliance</strong></td></tr> <tr><td>⚪</td><td><details><summary>🎫 <strong>No ticket provided </summary></strong> - [ ] Create ticket/issue  </details></td></tr> <tr><td colspan='2'><strong>Codebase Duplication Compliance</strong></td></tr> <tr><td>⚪</td><td><details><summary><strong>Codebase context is not defined </strong></summary> Follow the <a href='https://qodo-merge-docs.qodo.ai/core-abilities/rag_context_enrichment/'>guide</a> to enable codebase context checks. </details></td></tr> <tr><td colspan='2'><strong>Custom Compliance</strong></td></tr> <tr><td>⚪</td><td><details><summary><strong>No custom compliance provided</strong></summary> Follow the <a href='https://qodo-merge-docs.qodo.ai/tools/compliance/'>guide</a> to enable custom compliance check. </details></td></tr> <tr><td align="center" colspan="2"> - [ ] Update  </td></tr></tbody></table> <details><summary>Compliance status legend</summary> 🟢 - Fully Compliant<br> 🟡 - Partial Compliant<br> 🔴 - Not Compliant<br> ⚪ - Requires Further Human Verification<br> 🏷️ - Compliance label<br> </details>

qodo-code-review[bot] commented

2025-10-10 05:57:19 +00:00

(Migrated from github.com)

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Imported GitHub PR comment.

Original author: @qodo-code-review[bot]
Original URL: https://github.com/carverauto/serviceradar/pull/1736#issuecomment-3388392458
Original created: 2025-10-10T05:57:19Z

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
General	Improve local IP address discovery Improve the `localIP` function by removing its dependency on an external server. The suggested implementation iterates over the host's network interfaces to find a suitable non-loopback IP address, making it more robust. pkg/checker/sysmonvm/service.go [172-185] func localIP() string { - conn, err := net.Dial("udp", "8.8.8.8:80") + addrs, err := net.InterfaceAddrs() if err != nil { return "unknown" } - defer conn.Close() - localAddr, ok := conn.LocalAddr().(net.UDPAddr) - if !ok { - return "unknown" + for _, address := range addrs { + // Check the address type and if it is not a loopback, return it. + if ipnet, ok := address.(net.IPNet); ok && !ipnet.IP.IsLoopback() { + if ipnet.IP.To4() != nil { + return ipnet.IP.String() + } + } } - - return localAddr.IP.String() + return "unknown" } Apply / Chat Suggestion importance[1-10]: 7 __ Why: The suggestion correctly identifies that dialing an external address to find the local IP is fragile and proposes a more robust, dependency-free alternative by iterating over local network interfaces. This improves the reliability of the checker in environments without internet access.	Medium
General	Improve file reading performance for sysfs Optimize the `readSysfs` function for better performance when reading small sysfs files. Replace `os.ReadFile` with `os.Open` and a fixed-size buffer to reduce memory allocations. pkg/cpufreq/collector.go [98-118] func readSysfs(core int) (float64, bool) { path := filepath.Join(sysfsCpufreqPath, fmt.Sprintf("cpu%d/cpufreq/scaling_cur_freq", core)) - data, err := os.ReadFile(path) + f, err := os.Open(path) if err != nil { return 0, false } + defer f.Close() - raw := strings.TrimSpace(string(data)) + // Buffer is sufficient for frequency values. + buf := make([]byte, 32) + n, err := f.Read(buf) + if err != nil \|\| n == 0 { + return 0, false + } + + raw := strings.TrimSpace(string(buf[:n])) if raw == "" { return 0, false } // scaling_cur_freq is reported in kHz. val, err := strconv.ParseFloat(raw, 64) if err != nil { return 0, false } return val * 1_000, true } Apply / Chat Suggestion importance[1-10]: 4 __ Why: The suggestion offers a valid micro-optimization for reading small sysfs files by using `os.Open` and a buffer instead of `os.ReadFile`. While correct, the performance impact is likely minimal given the small file size and context of the application.	Low
Update

Imported GitHub PR comment. Original author: @qodo-code-review[bot] Original URL: https://github.com/carverauto/serviceradar/pull/1736#issuecomment-3388392458 Original created: 2025-10-10T05:57:19Z --- ## PR Code Suggestions ✨  Explore these optional code suggestions: <table><thead><tr><td><strong>Category</strong></td><td align=left><strong>Suggestion                                                                                                                                    </strong></td><td align=center><strong>Impact</strong></td></tr><tbody><tr><td rowspan=2>General</td> <td> <details><summary>Improve local IP address discovery</summary> ___ **Improve the <code>localIP</code> function by removing its dependency on an external server. <br>The suggested implementation iterates over the host's network interfaces to find <br>a suitable non-loopback IP address, making it more robust.** [pkg/checker/sysmonvm/service.go [172-185]](https://github.com/carverauto/serviceradar/pull/1736/files#diff-02211c03421188a7a92d44ce12a4ee8d9f09b224d7176b8713fcefac759ee989R172-R185) ```diff func localIP() string { - conn, err := net.Dial("udp", "8.8.8.8:80") + addrs, err := net.InterfaceAddrs() if err != nil { return "unknown" } - defer conn.Close() - localAddr, ok := conn.LocalAddr().(*net.UDPAddr) - if !ok { - return "unknown" + for _, address := range addrs { + // Check the address type and if it is not a loopback, return it. + if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() { + if ipnet.IP.To4() != nil { + return ipnet.IP.String() + } + } } - - return localAddr.IP.String() + return "unknown" } ``` - [ ] **Apply / Chat**  <details><summary>Suggestion importance[1-10]: 7</summary> __ Why: The suggestion correctly identifies that dialing an external address to find the local IP is fragile and proposes a more robust, dependency-free alternative by iterating over local network interfaces. This improves the reliability of the checker in environments without internet access. </details></details></td><td align=center>Medium </td></tr><tr><td> <details><summary>Improve file reading performance for sysfs</summary> ___ **Optimize the <code>readSysfs</code> function for better performance when reading small sysfs <br>files. Replace <code>os.ReadFile</code> with <code>os.Open</code> and a fixed-size buffer to reduce memory <br>allocations.** [pkg/cpufreq/collector.go [98-118]](https://github.com/carverauto/serviceradar/pull/1736/files#diff-35e6ecb698e97eb56fac27c2c42a1cb402cb477e408fc5bf08d7a7b233241b55R98-R118) ```diff func readSysfs(core int) (float64, bool) { path := filepath.Join(sysfsCpufreqPath, fmt.Sprintf("cpu%d/cpufreq/scaling_cur_freq", core)) - data, err := os.ReadFile(path) + f, err := os.Open(path) if err != nil { return 0, false } + defer f.Close() - raw := strings.TrimSpace(string(data)) + // Buffer is sufficient for frequency values. + buf := make([]byte, 32) + n, err := f.Read(buf) + if err != nil || n == 0 { + return 0, false + } + + raw := strings.TrimSpace(string(buf[:n])) if raw == "" { return 0, false } // scaling_cur_freq is reported in kHz. val, err := strconv.ParseFloat(raw, 64) if err != nil { return 0, false } return val * 1_000, true } ``` - [ ] **Apply / Chat**  <details><summary>Suggestion importance[1-10]: 4</summary> __ Why: The suggestion offers a valid micro-optimization for reading small sysfs files by using `os.Open` and a buffer instead of `os.ReadFile`. While correct, the performance impact is likely minimal given the small file size and context of the application. </details></details></td><td align=center>Low </td></tr> <tr><td align="center" colspan="2"> - [ ] Update  </td><td></td></tr></tbody></table>