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chore: config.alloy.tftpl 설정 변경 #16

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chore: config.alloy.tftpl 설정 변경 #16

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101 changes: 94 additions & 7 deletions config/side-infra/config.alloy.tftpl
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Original file line number Diff line number Diff line change
Expand Up @@ -7,25 +7,112 @@ logging {
format = "logfmt"
}

local.file_match "spring_logs" {
path_targets = [{ __path__ = "/var/log/spring/*.log" }] // 서비스 로그 파일 경로
// <1. 각 로그 레벨별로 파일 매칭
local.file_match "spring_info" {
path_targets = [{
__path__ = "/var/log/spring/info/*.log",
level = "info",
}]
}

loki.source.file "spring_source" {
targets = local.file_match.spring_logs.targets // 위에서 정의한 로그 파일 경로 사용
forward_to = [loki.process.spring_labels.receiver] // 읽은 로그를 처리 단계로 전달
local.file_match "spring_warn" {
path_targets = [{
__path__ = "/var/log/spring/warn/*.log",
level = "warn",
}]
}

loki.process "spring_labels" {
forward_to = [loki.write.grafana_loki.receiver] // 처리된 로그를 Loki로 전송
local.file_match "spring_error" {
path_targets = [{
__path__ = "/var/log/spring/error/*.log",
level = "error",
}]
}

local.file_match "spring_api_perf" {
path_targets = [{
__path__ = "/var/log/spring/api-perf/*.log",
level = "info",
log_type = "performance",
}]
}
// 1>

// <2. 각 소스 정의
loki.source.file "spring_info" {
targets = local.file_match.spring_info.targets
forward_to = [loki.process.spring_info_labels.receiver]
}

loki.source.file "spring_warn" {
targets = local.file_match.spring_warn.targets
forward_to = [loki.process.spring_warn_labels.receiver]
}

loki.source.file "spring_error" {
targets = local.file_match.spring_error.targets
forward_to = [loki.process.spring_error_labels.receiver]
}

loki.source.file "spring_api_perf" {
targets = local.file_match.spring_api_perf.targets
forward_to = [loki.process.spring_api_perf_labels.receiver]
}
// 2>

// <3. 각 프로세서 정의 (레벨별 라벨 추가)
loki.process "spring_info_labels" {
forward_to = [loki.write.grafana_loki.receiver]

stage.static_labels {
values = {
service = "backend",
env = sys.env("ALLOY_ENV"),
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@coderabbitai coderabbitai bot Jan 12, 2026

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⚠️ Potential issue | 🟡 Minor

🧩 Analysis chain

🌐 Web query:

Grafana Alloy sys.env function behavior undefined environment variable

💡 Result:

Short answer: sys.env returns an empty string ("") when the named environment variable does not exist — not null or an error. Use coalesce or test for "" to provide a default. [1][2]

Examples:

  • sys.env("DOES_NOT_EXIST") => "" . [1]
  • coalesce(sys.env("DOES_NOT_EXIST"), "default") => "default". [2]

Note: if you see errors like "component 'sys.env' does not exist or is out of scope", that usually means the expression was used in a context where functions/stdlib aren’t available or referenced incorrectly — check placement/scope in your config. [3]

Sources: Grafana Alloy docs for sys.env and coalesce; community forum thread. [1][2][3]

🏁 Script executed:

# Search for the config file and examine the context around lines 70, 83, 96, 109
find . -name "config.alloy.tftpl" -o -name "*.alloy" | head -20

Repository: solid-connection/solid-connection-infra

Length of output: 121

🏁 Script executed:

# Examine the config file around the mentioned lines
cat -n ./config/side-infra/config.alloy.tftpl | sed -n '50,120p'

Repository: solid-connection/solid-connection-infra

Length of output: 2099

배포 환경에서 ALLOY_ENV 환경 변수 설정 확인

sys.env("ALLOY_ENV")가 설정되지 않은 경우 빈 문자열을 반환하므로, 로그의 env 레이블이 비어있게 됩니다. 배포 환경에서 ALLOY_ENV 환경 변수가 항상 설정되어 있는지 확인하세요. 필요시 coalesce(sys.env("ALLOY_ENV"), "unknown")를 사용하여 기본값을 설정할 수 있습니다.

또한 적용됨: 83-83, 96-96, 109-109

🤖 Prompt for AI Agents 
In @config/side-infra/config.alloy.tftpl at line 70, The template currently uses
sys.env("ALLOY_ENV") which returns an empty string if unset; update each
occurrence of sys.env("ALLOY_ENV") (including the instances used for the env
label) to wrap it with coalesce(sys.env("ALLOY_ENV"), "unknown") so the env
label defaults to "unknown" when the ALLOY_ENV variable is not set; apply this
change to all occurrences mentioned in the review.

level = "info",
log_type = "application",
}
}
}

loki.process "spring_warn_labels" {
forward_to = [loki.write.grafana_loki.receiver]

stage.static_labels {
values = {
service = "backend",
env = sys.env("ALLOY_ENV"),
level = "warn",
log_type = "application",
}
}
}

loki.process "spring_error_labels" {
forward_to = [loki.write.grafana_loki.receiver]

stage.static_labels {
values = {
service = "backend",
env = sys.env("ALLOY_ENV"),
level = "error",
log_type = "application",
}
}
}

loki.process "spring_api_perf_labels" {
forward_to = [loki.write.grafana_loki.receiver]

stage.static_labels {
values = {
service = "backend",
env = sys.env("ALLOY_ENV"),
level = "info",
log_type = "performance",
}
}
}
// 3>

loki.write "grafana_loki" {
endpoint {
Expand Down