feat(php): add php dashboards with APM snippet and alerts

packs/php/cakephp/alerts/duration.yml

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+---
+
+name: High duration
+
+details: |+
+  This alert is triggered when the total duration of the web transaction is longer than 10 seconds during 5 minutes
+
+type: STATIC
+
+nrql:
+  query: "FROM Transaction select average(duration) where transactionType = 'Web'"
+
+# Function used to aggregate the NRQL query value(s) for comparison to the terms.threshold (Default: SINGLE_VALUE)
+valueFunction: SINGLE_VALUE
+
+# List of Critical and Warning thresholds for the condition
+terms:
+- priority: CRITICAL
+  # Operator used to compare against the threshold.
+  operator: ABOVE
+  # Value that triggers a violation
+  threshold: 10
+  # Time in seconds; 120 - 3600
+  thresholdDuration: 300
+  # How many data points must be in violation for the duration
+  thresholdOccurrences: ALL
+
+# Duration after which a violation automatically closes
+# Time in seconds; 300 - 2592000 (Default: 86400 [1 day])
+violationTimeLimitSeconds: 86400

packs/php/cakephp/alerts/error rate.yml

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+---
+
+name: High error rate
+
+details: |+
+  This alert is triggered when the error percentage of web transactions is higher than 5% during 5 minutes
+
+type: STATIC
+
+nrql:
+  query: "FROM Transaction SELECT percentage(count(*), where error is not false) as 'Errors' where transactionType = 'Web'"
+
+# Function used to aggregate the NRQL query value(s) for comparison to the terms.threshold (Default: SINGLE_VALUE)
+valueFunction: SINGLE_VALUE
+
+# List of Critical and Warning thresholds for the condition
+terms:
+- priority: CRITICAL
+  # Operator used to compare against the threshold.
+  operator: ABOVE
+  # Value that triggers a violation
+  threshold: 5
+  # Time in seconds; 120 - 3600
+  thresholdDuration: 300
+  # How many data points must be in violation for the duration
+  thresholdOccurrences: ALL
+
+# Duration after which a violation automatically closes
+# Time in seconds; 300 - 2592000 (Default: 86400 [1 day])
+violationTimeLimitSeconds: 86400

packs/php/cakephp/alerts/throughput.yml

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+---
+
+name: Low throughput
+
+details: |+
+  This alert is triggered when the throughput is 0 for 5 minutes
+
+type: STATIC
+
+nrql:
+  query: "FROM Transaction SELECT count(*) where transactionType = 'Web'"
+
+# Function used to aggregate the NRQL query value(s) for comparison to the terms.threshold (Default: SINGLE_VALUE)
+valueFunction: SINGLE_VALUE
+
+# List of Critical and Warning thresholds for the condition
+terms:
+- priority: CRITICAL
+  # Operator used to compare against the threshold.
+  operator: EQUALS
+  # Value that triggers a violation
+  threshold: 0
+  # Time in seconds; 120 - 3600
+  thresholdDuration: 300
+  # How many data points must be in violation for the duration
+  thresholdOccurrences: ALL
+
+# Duration after which a violation automatically closes
+# Time in seconds; 300 - 2592000 (Default: 86400 [1 day])
+violationTimeLimitSeconds: 86400