diff --git a/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/__snapshots__/occurrences.test.ts.snap b/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/__snapshots__/occurrences.test.ts.snap
new file mode 100644
index 0000000000000..114ae4de393fa
--- /dev/null
+++ b/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/__snapshots__/occurrences.test.ts.snap
@@ -0,0 +1,745 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Summary Transform Generator for 'Occurrences' SLO generates the correct transform for a 30days rolling SLO 1`] = `
+Object {
+  "_meta": Object {
+    "managed": true,
+    "managed_by": "observability",
+    "version": 3.3,
+  },
+  "defer_validation": true,
+  "description": "Summarise the rollup data of SLO: irrelevant [id: irrelevant, revision: 1].",
+  "dest": Object {
+    "index": ".slo-observability.summary-v3.3",
+    "pipeline": ".slo-observability.summary.pipeline-irrelevant-1",
+  },
+  "frequency": "1m",
+  "pivot": Object {
+    "aggregations": Object {
+      "errorBudgetConsumed": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "errorBudgetInitial": "errorBudgetInitial",
+            "sliValue": "sliValue",
+          },
+          "script": "if (params.sliValue == -1) { return 0 } else { return (1 - params.sliValue) / params.errorBudgetInitial }",
+        },
+      },
+      "errorBudgetInitial": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {},
+          "script": "1 - 0.999",
+        },
+      },
+      "errorBudgetRemaining": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "errorBudgetConsumed": "errorBudgetConsumed",
+          },
+          "script": "1 - params.errorBudgetConsumed",
+        },
+      },
+      "fiveMinuteBurnRate": Object {
+        "aggs": Object {
+          "goodEvents": Object {
+            "sum": Object {
+              "field": "slo.numerator",
+            },
+          },
+          "totalEvents": Object {
+            "sum": Object {
+              "field": "slo.denominator",
+            },
+          },
+        },
+        "filter": Object {
+          "range": Object {
+            "@timestamp": Object {
+              "gte": "now-480s/m",
+              "lte": "now-180s/m",
+            },
+          },
+        },
+      },
+      "goodEvents": Object {
+        "sum": Object {
+          "field": "slo.numerator",
+        },
+      },
+      "latestSliTimestamp": Object {
+        "max": Object {
+          "field": "@timestamp",
+        },
+      },
+      "oneDayBurnRate": Object {
+        "aggs": Object {
+          "goodEvents": Object {
+            "sum": Object {
+              "field": "slo.numerator",
+            },
+          },
+          "totalEvents": Object {
+            "sum": Object {
+              "field": "slo.denominator",
+            },
+          },
+        },
+        "filter": Object {
+          "range": Object {
+            "@timestamp": Object {
+              "gte": "now-86580s/m",
+              "lte": "now-180s/m",
+            },
+          },
+        },
+      },
+      "oneHourBurnRate": Object {
+        "aggs": Object {
+          "goodEvents": Object {
+            "sum": Object {
+              "field": "slo.numerator",
+            },
+          },
+          "totalEvents": Object {
+            "sum": Object {
+              "field": "slo.denominator",
+            },
+          },
+        },
+        "filter": Object {
+          "range": Object {
+            "@timestamp": Object {
+              "gte": "now-3780s/m",
+              "lte": "now-180s/m",
+            },
+          },
+        },
+      },
+      "sliValue": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "goodEvents": "goodEvents",
+            "totalEvents": "totalEvents",
+          },
+          "script": "if (params.totalEvents == 0) { return -1 } else if (params.goodEvents >= params.totalEvents) { return 1 } else { return params.goodEvents / params.totalEvents }",
+        },
+      },
+      "statusCode": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "errorBudgetRemaining": "errorBudgetRemaining",
+            "sliValue": "sliValue",
+          },
+          "script": Object {
+            "source": "if (params.sliValue == -1) { return 0 } else if (params.sliValue >= 0.999) { return 4 } else if (params.errorBudgetRemaining > 0) { return 2 } else { return 1 }",
+          },
+        },
+      },
+      "totalEvents": Object {
+        "sum": Object {
+          "field": "slo.denominator",
+        },
+      },
+    },
+    "group_by": Object {
+      "monitor.config_id": Object {
+        "terms": Object {
+          "field": "monitor.config_id",
+          "missing_bucket": true,
+        },
+      },
+      "monitor.name": Object {
+        "terms": Object {
+          "field": "monitor.name",
+          "missing_bucket": true,
+        },
+      },
+      "observer.geo.name": Object {
+        "terms": Object {
+          "field": "observer.geo.name",
+          "missing_bucket": true,
+        },
+      },
+      "observer.name": Object {
+        "terms": Object {
+          "field": "observer.name",
+          "missing_bucket": true,
+        },
+      },
+      "service.environment": Object {
+        "terms": Object {
+          "field": "service.environment",
+          "missing_bucket": true,
+        },
+      },
+      "service.name": Object {
+        "terms": Object {
+          "field": "service.name",
+          "missing_bucket": true,
+        },
+      },
+      "slo.id": Object {
+        "terms": Object {
+          "field": "slo.id",
+        },
+      },
+      "slo.instanceId": Object {
+        "terms": Object {
+          "field": "slo.instanceId",
+        },
+      },
+      "slo.revision": Object {
+        "terms": Object {
+          "field": "slo.revision",
+        },
+      },
+      "transaction.name": Object {
+        "terms": Object {
+          "field": "transaction.name",
+          "missing_bucket": true,
+        },
+      },
+      "transaction.type": Object {
+        "terms": Object {
+          "field": "transaction.type",
+          "missing_bucket": true,
+        },
+      },
+    },
+  },
+  "settings": Object {
+    "deduce_mappings": false,
+    "unattended": true,
+  },
+  "source": Object {
+    "index": ".slo-observability.sli-v3.3*",
+    "query": Object {
+      "bool": Object {
+        "filter": Array [
+          Object {
+            "range": Object {
+              "@timestamp": Object {
+                "gte": "now-30d/m",
+                "lte": "now/m",
+              },
+            },
+          },
+          Object {
+            "term": Object {
+              "slo.id": "irrelevant",
+            },
+          },
+          Object {
+            "term": Object {
+              "slo.revision": 1,
+            },
+          },
+        ],
+      },
+    },
+  },
+  "sync": Object {
+    "time": Object {
+      "delay": "65s",
+      "field": "event.ingested",
+    },
+  },
+  "transform_id": "slo-summary-irrelevant-1",
+}
+`;
+
+exports[`Summary Transform Generator for 'Occurrences' SLO generates the correct transform for a monthly calendar aligned SLO 1`] = `
+Object {
+  "_meta": Object {
+    "managed": true,
+    "managed_by": "observability",
+    "version": 3.3,
+  },
+  "defer_validation": true,
+  "description": "Summarise the rollup data of SLO: irrelevant [id: irrelevant, revision: 1].",
+  "dest": Object {
+    "index": ".slo-observability.summary-v3.3",
+    "pipeline": ".slo-observability.summary.pipeline-irrelevant-1",
+  },
+  "frequency": "1m",
+  "pivot": Object {
+    "aggregations": Object {
+      "errorBudgetConsumed": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "errorBudgetInitial": "errorBudgetInitial",
+            "sliValue": "sliValue",
+          },
+          "script": "if (params.sliValue == -1) { return 0 } else { return (1 - params.sliValue) / params.errorBudgetInitial }",
+        },
+      },
+      "errorBudgetInitial": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {},
+          "script": "1 - 0.999",
+        },
+      },
+      "errorBudgetRemaining": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "errorBudgetConsumed": "errorBudgetConsumed",
+          },
+          "script": "1 - params.errorBudgetConsumed",
+        },
+      },
+      "fiveMinuteBurnRate": Object {
+        "aggs": Object {
+          "goodEvents": Object {
+            "sum": Object {
+              "field": "slo.numerator",
+            },
+          },
+          "totalEvents": Object {
+            "sum": Object {
+              "field": "slo.denominator",
+            },
+          },
+        },
+        "filter": Object {
+          "range": Object {
+            "@timestamp": Object {
+              "gte": "now-480s/m",
+              "lte": "now-180s/m",
+            },
+          },
+        },
+      },
+      "goodEvents": Object {
+        "sum": Object {
+          "field": "slo.numerator",
+        },
+      },
+      "latestSliTimestamp": Object {
+        "max": Object {
+          "field": "@timestamp",
+        },
+      },
+      "oneDayBurnRate": Object {
+        "aggs": Object {
+          "goodEvents": Object {
+            "sum": Object {
+              "field": "slo.numerator",
+            },
+          },
+          "totalEvents": Object {
+            "sum": Object {
+              "field": "slo.denominator",
+            },
+          },
+        },
+        "filter": Object {
+          "range": Object {
+            "@timestamp": Object {
+              "gte": "now-86580s/m",
+              "lte": "now-180s/m",
+            },
+          },
+        },
+      },
+      "oneHourBurnRate": Object {
+        "aggs": Object {
+          "goodEvents": Object {
+            "sum": Object {
+              "field": "slo.numerator",
+            },
+          },
+          "totalEvents": Object {
+            "sum": Object {
+              "field": "slo.denominator",
+            },
+          },
+        },
+        "filter": Object {
+          "range": Object {
+            "@timestamp": Object {
+              "gte": "now-3780s/m",
+              "lte": "now-180s/m",
+            },
+          },
+        },
+      },
+      "sliValue": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "goodEvents": "goodEvents",
+            "totalEvents": "totalEvents",
+          },
+          "script": "if (params.totalEvents == 0) { return -1 } else if (params.goodEvents >= params.totalEvents) { return 1 } else { return params.goodEvents / params.totalEvents }",
+        },
+      },
+      "statusCode": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "errorBudgetRemaining": "errorBudgetRemaining",
+            "sliValue": "sliValue",
+          },
+          "script": Object {
+            "source": "if (params.sliValue == -1) { return 0 } else if (params.sliValue >= 0.999) { return 4 } else if (params.errorBudgetRemaining > 0) { return 2 } else { return 1 }",
+          },
+        },
+      },
+      "totalEvents": Object {
+        "sum": Object {
+          "field": "slo.denominator",
+        },
+      },
+    },
+    "group_by": Object {
+      "monitor.config_id": Object {
+        "terms": Object {
+          "field": "monitor.config_id",
+          "missing_bucket": true,
+        },
+      },
+      "monitor.name": Object {
+        "terms": Object {
+          "field": "monitor.name",
+          "missing_bucket": true,
+        },
+      },
+      "observer.geo.name": Object {
+        "terms": Object {
+          "field": "observer.geo.name",
+          "missing_bucket": true,
+        },
+      },
+      "observer.name": Object {
+        "terms": Object {
+          "field": "observer.name",
+          "missing_bucket": true,
+        },
+      },
+      "service.environment": Object {
+        "terms": Object {
+          "field": "service.environment",
+          "missing_bucket": true,
+        },
+      },
+      "service.name": Object {
+        "terms": Object {
+          "field": "service.name",
+          "missing_bucket": true,
+        },
+      },
+      "slo.id": Object {
+        "terms": Object {
+          "field": "slo.id",
+        },
+      },
+      "slo.instanceId": Object {
+        "terms": Object {
+          "field": "slo.instanceId",
+        },
+      },
+      "slo.revision": Object {
+        "terms": Object {
+          "field": "slo.revision",
+        },
+      },
+      "transaction.name": Object {
+        "terms": Object {
+          "field": "transaction.name",
+          "missing_bucket": true,
+        },
+      },
+      "transaction.type": Object {
+        "terms": Object {
+          "field": "transaction.type",
+          "missing_bucket": true,
+        },
+      },
+    },
+  },
+  "settings": Object {
+    "deduce_mappings": false,
+    "unattended": true,
+  },
+  "source": Object {
+    "index": ".slo-observability.sli-v3.3*",
+    "query": Object {
+      "bool": Object {
+        "filter": Array [
+          Object {
+            "range": Object {
+              "@timestamp": Object {
+                "gte": "now/M",
+                "lte": "now/m",
+              },
+            },
+          },
+          Object {
+            "term": Object {
+              "slo.id": "irrelevant",
+            },
+          },
+          Object {
+            "term": Object {
+              "slo.revision": 1,
+            },
+          },
+        ],
+      },
+    },
+  },
+  "sync": Object {
+    "time": Object {
+      "delay": "65s",
+      "field": "event.ingested",
+    },
+  },
+  "transform_id": "slo-summary-irrelevant-1",
+}
+`;
+
+exports[`Summary Transform Generator for 'Occurrences' SLO generates the correct transform for a weekly calendar aligned SLO 1`] = `
+Object {
+  "_meta": Object {
+    "managed": true,
+    "managed_by": "observability",
+    "version": 3.3,
+  },
+  "defer_validation": true,
+  "description": "Summarise the rollup data of SLO: irrelevant [id: irrelevant, revision: 1].",
+  "dest": Object {
+    "index": ".slo-observability.summary-v3.3",
+    "pipeline": ".slo-observability.summary.pipeline-irrelevant-1",
+  },
+  "frequency": "1m",
+  "pivot": Object {
+    "aggregations": Object {
+      "errorBudgetConsumed": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "errorBudgetInitial": "errorBudgetInitial",
+            "sliValue": "sliValue",
+          },
+          "script": "if (params.sliValue == -1) { return 0 } else { return (1 - params.sliValue) / params.errorBudgetInitial }",
+        },
+      },
+      "errorBudgetInitial": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {},
+          "script": "1 - 0.999",
+        },
+      },
+      "errorBudgetRemaining": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "errorBudgetConsumed": "errorBudgetConsumed",
+          },
+          "script": "1 - params.errorBudgetConsumed",
+        },
+      },
+      "fiveMinuteBurnRate": Object {
+        "aggs": Object {
+          "goodEvents": Object {
+            "sum": Object {
+              "field": "slo.numerator",
+            },
+          },
+          "totalEvents": Object {
+            "sum": Object {
+              "field": "slo.denominator",
+            },
+          },
+        },
+        "filter": Object {
+          "range": Object {
+            "@timestamp": Object {
+              "gte": "now-480s/m",
+              "lte": "now-180s/m",
+            },
+          },
+        },
+      },
+      "goodEvents": Object {
+        "sum": Object {
+          "field": "slo.numerator",
+        },
+      },
+      "latestSliTimestamp": Object {
+        "max": Object {
+          "field": "@timestamp",
+        },
+      },
+      "oneDayBurnRate": Object {
+        "aggs": Object {
+          "goodEvents": Object {
+            "sum": Object {
+              "field": "slo.numerator",
+            },
+          },
+          "totalEvents": Object {
+            "sum": Object {
+              "field": "slo.denominator",
+            },
+          },
+        },
+        "filter": Object {
+          "range": Object {
+            "@timestamp": Object {
+              "gte": "now-86580s/m",
+              "lte": "now-180s/m",
+            },
+          },
+        },
+      },
+      "oneHourBurnRate": Object {
+        "aggs": Object {
+          "goodEvents": Object {
+            "sum": Object {
+              "field": "slo.numerator",
+            },
+          },
+          "totalEvents": Object {
+            "sum": Object {
+              "field": "slo.denominator",
+            },
+          },
+        },
+        "filter": Object {
+          "range": Object {
+            "@timestamp": Object {
+              "gte": "now-3780s/m",
+              "lte": "now-180s/m",
+            },
+          },
+        },
+      },
+      "sliValue": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "goodEvents": "goodEvents",
+            "totalEvents": "totalEvents",
+          },
+          "script": "if (params.totalEvents == 0) { return -1 } else if (params.goodEvents >= params.totalEvents) { return 1 } else { return params.goodEvents / params.totalEvents }",
+        },
+      },
+      "statusCode": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "errorBudgetRemaining": "errorBudgetRemaining",
+            "sliValue": "sliValue",
+          },
+          "script": Object {
+            "source": "if (params.sliValue == -1) { return 0 } else if (params.sliValue >= 0.999) { return 4 } else if (params.errorBudgetRemaining > 0) { return 2 } else { return 1 }",
+          },
+        },
+      },
+      "totalEvents": Object {
+        "sum": Object {
+          "field": "slo.denominator",
+        },
+      },
+    },
+    "group_by": Object {
+      "monitor.config_id": Object {
+        "terms": Object {
+          "field": "monitor.config_id",
+          "missing_bucket": true,
+        },
+      },
+      "monitor.name": Object {
+        "terms": Object {
+          "field": "monitor.name",
+          "missing_bucket": true,
+        },
+      },
+      "observer.geo.name": Object {
+        "terms": Object {
+          "field": "observer.geo.name",
+          "missing_bucket": true,
+        },
+      },
+      "observer.name": Object {
+        "terms": Object {
+          "field": "observer.name",
+          "missing_bucket": true,
+        },
+      },
+      "service.environment": Object {
+        "terms": Object {
+          "field": "service.environment",
+          "missing_bucket": true,
+        },
+      },
+      "service.name": Object {
+        "terms": Object {
+          "field": "service.name",
+          "missing_bucket": true,
+        },
+      },
+      "slo.id": Object {
+        "terms": Object {
+          "field": "slo.id",
+        },
+      },
+      "slo.instanceId": Object {
+        "terms": Object {
+          "field": "slo.instanceId",
+        },
+      },
+      "slo.revision": Object {
+        "terms": Object {
+          "field": "slo.revision",
+        },
+      },
+      "transaction.name": Object {
+        "terms": Object {
+          "field": "transaction.name",
+          "missing_bucket": true,
+        },
+      },
+      "transaction.type": Object {
+        "terms": Object {
+          "field": "transaction.type",
+          "missing_bucket": true,
+        },
+      },
+    },
+  },
+  "settings": Object {
+    "deduce_mappings": false,
+    "unattended": true,
+  },
+  "source": Object {
+    "index": ".slo-observability.sli-v3.3*",
+    "query": Object {
+      "bool": Object {
+        "filter": Array [
+          Object {
+            "range": Object {
+              "@timestamp": Object {
+                "gte": "now/w",
+                "lte": "now/m",
+              },
+            },
+          },
+          Object {
+            "term": Object {
+              "slo.id": "irrelevant",
+            },
+          },
+          Object {
+            "term": Object {
+              "slo.revision": 1,
+            },
+          },
+        ],
+      },
+    },
+  },
+  "sync": Object {
+    "time": Object {
+      "delay": "65s",
+      "field": "event.ingested",
+    },
+  },
+  "transform_id": "slo-summary-irrelevant-1",
+}
+`;
diff --git a/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/__snapshots__/timeslices_calendar_aligned.test.ts.snap b/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/__snapshots__/timeslices_calendar_aligned.test.ts.snap
new file mode 100644
index 0000000000000..ea635841aea6b
--- /dev/null
+++ b/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/__snapshots__/timeslices_calendar_aligned.test.ts.snap
@@ -0,0 +1,273 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Summary Transform Generator for 'Timeslices' and 'CalendarAligned' SLO generates the correct transform for a 7 days SLO 1`] = `
+Object {
+  "_meta": Object {
+    "managed": true,
+    "managed_by": "observability",
+    "version": 3.3,
+  },
+  "defer_validation": true,
+  "description": "Summarise the rollup data of SLO: irrelevant [id: irrelevant, revision: 1].",
+  "dest": Object {
+    "index": ".slo-observability.summary-v3.3",
+    "pipeline": ".slo-observability.summary.pipeline-irrelevant-1",
+  },
+  "frequency": "1m",
+  "pivot": Object {
+    "aggregations": Object {
+      "_totalSlicesInPeriod": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {},
+          "script": Object {
+            "source": "
+                if (false == true) {
+                  return Math.ceil(7 * 24 * 60 * 60 / 120);
+                } else {
+                  Date d = new Date(); 
+                  Instant instant = Instant.ofEpochMilli(d.getTime());
+                  LocalDateTime now = LocalDateTime.ofInstant(instant, ZoneOffset.UTC);
+                  LocalDateTime startOfMonth = now
+                    .withDayOfMonth(1)
+                    .withHour(0)
+                    .withMinute(0)
+                    .withSecond(0);
+                  LocalDateTime startOfNextMonth = startOfMonth.plusMonths(1);
+                  double sliceDurationInMinutes = 120 / 60;
+                  
+                  return Math.ceil(Duration.between(startOfMonth, startOfNextMonth).toMinutes() / sliceDurationInMinutes);
+                }
+              ",
+          },
+        },
+      },
+      "errorBudgetConsumed": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "errorBudgetInitial": "errorBudgetInitial",
+            "sliValue": "sliValue",
+          },
+          "script": "if (params.sliValue == -1) { return 0 } else { return (1 - params.sliValue) / params.errorBudgetInitial }",
+        },
+      },
+      "errorBudgetInitial": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {},
+          "script": "1 - 0.98",
+        },
+      },
+      "errorBudgetRemaining": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "errorBudgetConsumed": "errorBudgetConsumed",
+          },
+          "script": "1 - params.errorBudgetConsumed",
+        },
+      },
+      "fiveMinuteBurnRate": Object {
+        "aggs": Object {
+          "goodEvents": Object {
+            "sum": Object {
+              "field": "slo.isGoodSlice",
+            },
+          },
+          "totalEvents": Object {
+            "value_count": Object {
+              "field": "slo.isGoodSlice",
+            },
+          },
+        },
+        "filter": Object {
+          "range": Object {
+            "@timestamp": Object {
+              "gte": "now-540s/m",
+              "lte": "now-240s/m",
+            },
+          },
+        },
+      },
+      "goodEvents": Object {
+        "sum": Object {
+          "field": "slo.isGoodSlice",
+        },
+      },
+      "latestSliTimestamp": Object {
+        "max": Object {
+          "field": "@timestamp",
+        },
+      },
+      "oneDayBurnRate": Object {
+        "aggs": Object {
+          "goodEvents": Object {
+            "sum": Object {
+              "field": "slo.isGoodSlice",
+            },
+          },
+          "totalEvents": Object {
+            "value_count": Object {
+              "field": "slo.isGoodSlice",
+            },
+          },
+        },
+        "filter": Object {
+          "range": Object {
+            "@timestamp": Object {
+              "gte": "now-86640s/m",
+              "lte": "now-240s/m",
+            },
+          },
+        },
+      },
+      "oneHourBurnRate": Object {
+        "aggs": Object {
+          "goodEvents": Object {
+            "sum": Object {
+              "field": "slo.isGoodSlice",
+            },
+          },
+          "totalEvents": Object {
+            "value_count": Object {
+              "field": "slo.isGoodSlice",
+            },
+          },
+        },
+        "filter": Object {
+          "range": Object {
+            "@timestamp": Object {
+              "gte": "now-3840s/m",
+              "lte": "now-240s/m",
+            },
+          },
+        },
+      },
+      "sliValue": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "goodEvents": "goodEvents",
+            "totalEvents": "totalEvents",
+            "totalSlicesInPeriod": "_totalSlicesInPeriod",
+          },
+          "script": "if (params.totalEvents == 0) { return -1 } else if (params.goodEvents >= params.totalEvents) { return 1 } else { return 1 - (params.totalEvents - params.goodEvents) / params.totalSlicesInPeriod }",
+        },
+      },
+      "statusCode": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "errorBudgetRemaining": "errorBudgetRemaining",
+            "sliValue": "sliValue",
+          },
+          "script": "if (params.sliValue == -1) { return 0 } else if (params.sliValue >= 0.98) { return 4 } else if (params.errorBudgetRemaining > 0) { return 2 } else { return 1 }",
+        },
+      },
+      "totalEvents": Object {
+        "value_count": Object {
+          "field": "slo.isGoodSlice",
+        },
+      },
+    },
+    "group_by": Object {
+      "monitor.config_id": Object {
+        "terms": Object {
+          "field": "monitor.config_id",
+          "missing_bucket": true,
+        },
+      },
+      "monitor.name": Object {
+        "terms": Object {
+          "field": "monitor.name",
+          "missing_bucket": true,
+        },
+      },
+      "observer.geo.name": Object {
+        "terms": Object {
+          "field": "observer.geo.name",
+          "missing_bucket": true,
+        },
+      },
+      "observer.name": Object {
+        "terms": Object {
+          "field": "observer.name",
+          "missing_bucket": true,
+        },
+      },
+      "service.environment": Object {
+        "terms": Object {
+          "field": "service.environment",
+          "missing_bucket": true,
+        },
+      },
+      "service.name": Object {
+        "terms": Object {
+          "field": "service.name",
+          "missing_bucket": true,
+        },
+      },
+      "slo.id": Object {
+        "terms": Object {
+          "field": "slo.id",
+        },
+      },
+      "slo.instanceId": Object {
+        "terms": Object {
+          "field": "slo.instanceId",
+        },
+      },
+      "slo.revision": Object {
+        "terms": Object {
+          "field": "slo.revision",
+        },
+      },
+      "transaction.name": Object {
+        "terms": Object {
+          "field": "transaction.name",
+          "missing_bucket": true,
+        },
+      },
+      "transaction.type": Object {
+        "terms": Object {
+          "field": "transaction.type",
+          "missing_bucket": true,
+        },
+      },
+    },
+  },
+  "settings": Object {
+    "deduce_mappings": false,
+    "unattended": true,
+  },
+  "source": Object {
+    "index": ".slo-observability.sli-v3.3*",
+    "query": Object {
+      "bool": Object {
+        "filter": Array [
+          Object {
+            "range": Object {
+              "@timestamp": Object {
+                "gte": "now/M",
+                "lte": "now/m",
+              },
+            },
+          },
+          Object {
+            "term": Object {
+              "slo.id": "irrelevant",
+            },
+          },
+          Object {
+            "term": Object {
+              "slo.revision": 1,
+            },
+          },
+        ],
+      },
+    },
+  },
+  "sync": Object {
+    "time": Object {
+      "delay": "65s",
+      "field": "event.ingested",
+    },
+  },
+  "transform_id": "slo-summary-irrelevant-1",
+}
+`;
diff --git a/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/__snapshots__/timeslices_rolling.test.ts.snap b/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/__snapshots__/timeslices_rolling.test.ts.snap
new file mode 100644
index 0000000000000..d01bc36872fb5
--- /dev/null
+++ b/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/__snapshots__/timeslices_rolling.test.ts.snap
@@ -0,0 +1,249 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Summary Transform Generator for 'Timeslices' and 'Rolling' SLO generates the correct transform for a 7 days SLO 1`] = `
+Object {
+  "_meta": Object {
+    "managed": true,
+    "managed_by": "observability",
+    "version": 3.3,
+  },
+  "defer_validation": true,
+  "description": "Summarise the rollup data of SLO: irrelevant [id: irrelevant, revision: 1].",
+  "dest": Object {
+    "index": ".slo-observability.summary-v3.3",
+    "pipeline": ".slo-observability.summary.pipeline-irrelevant-1",
+  },
+  "frequency": "1m",
+  "pivot": Object {
+    "aggregations": Object {
+      "errorBudgetConsumed": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "errorBudgetInitial": "errorBudgetInitial",
+            "sliValue": "sliValue",
+          },
+          "script": "if (params.sliValue == -1) { return 0 } else { return (1 - params.sliValue) / params.errorBudgetInitial }",
+        },
+      },
+      "errorBudgetInitial": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {},
+          "script": "1 - 0.98",
+        },
+      },
+      "errorBudgetRemaining": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "errorBudgetConsumed": "errorBudgetConsumed",
+          },
+          "script": "1 - params.errorBudgetConsumed",
+        },
+      },
+      "fiveMinuteBurnRate": Object {
+        "aggs": Object {
+          "goodEvents": Object {
+            "sum": Object {
+              "field": "slo.isGoodSlice",
+            },
+          },
+          "totalEvents": Object {
+            "value_count": Object {
+              "field": "slo.isGoodSlice",
+            },
+          },
+        },
+        "filter": Object {
+          "range": Object {
+            "@timestamp": Object {
+              "gte": "now-540s/m",
+              "lte": "now-240s/m",
+            },
+          },
+        },
+      },
+      "goodEvents": Object {
+        "sum": Object {
+          "field": "slo.isGoodSlice",
+        },
+      },
+      "latestSliTimestamp": Object {
+        "max": Object {
+          "field": "@timestamp",
+        },
+      },
+      "oneDayBurnRate": Object {
+        "aggs": Object {
+          "goodEvents": Object {
+            "sum": Object {
+              "field": "slo.isGoodSlice",
+            },
+          },
+          "totalEvents": Object {
+            "value_count": Object {
+              "field": "slo.isGoodSlice",
+            },
+          },
+        },
+        "filter": Object {
+          "range": Object {
+            "@timestamp": Object {
+              "gte": "now-86640s/m",
+              "lte": "now-240s/m",
+            },
+          },
+        },
+      },
+      "oneHourBurnRate": Object {
+        "aggs": Object {
+          "goodEvents": Object {
+            "sum": Object {
+              "field": "slo.isGoodSlice",
+            },
+          },
+          "totalEvents": Object {
+            "value_count": Object {
+              "field": "slo.isGoodSlice",
+            },
+          },
+        },
+        "filter": Object {
+          "range": Object {
+            "@timestamp": Object {
+              "gte": "now-3840s/m",
+              "lte": "now-240s/m",
+            },
+          },
+        },
+      },
+      "sliValue": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "goodEvents": "goodEvents",
+            "totalEvents": "totalEvents",
+          },
+          "script": "if (params.totalEvents == 0) { return -1 } else if (params.goodEvents >= params.totalEvents) { return 1 } else { return 1 - (params.totalEvents - params.goodEvents) / 5040 }",
+        },
+      },
+      "statusCode": Object {
+        "bucket_script": Object {
+          "buckets_path": Object {
+            "errorBudgetRemaining": "errorBudgetRemaining",
+            "sliValue": "sliValue",
+          },
+          "script": Object {
+            "source": "if (params.sliValue == -1) { return 0 } else if (params.sliValue >= 0.98) { return 4 } else if (params.errorBudgetRemaining > 0) { return 2 } else { return 1 }",
+          },
+        },
+      },
+      "totalEvents": Object {
+        "value_count": Object {
+          "field": "slo.isGoodSlice",
+        },
+      },
+    },
+    "group_by": Object {
+      "monitor.config_id": Object {
+        "terms": Object {
+          "field": "monitor.config_id",
+          "missing_bucket": true,
+        },
+      },
+      "monitor.name": Object {
+        "terms": Object {
+          "field": "monitor.name",
+          "missing_bucket": true,
+        },
+      },
+      "observer.geo.name": Object {
+        "terms": Object {
+          "field": "observer.geo.name",
+          "missing_bucket": true,
+        },
+      },
+      "observer.name": Object {
+        "terms": Object {
+          "field": "observer.name",
+          "missing_bucket": true,
+        },
+      },
+      "service.environment": Object {
+        "terms": Object {
+          "field": "service.environment",
+          "missing_bucket": true,
+        },
+      },
+      "service.name": Object {
+        "terms": Object {
+          "field": "service.name",
+          "missing_bucket": true,
+        },
+      },
+      "slo.id": Object {
+        "terms": Object {
+          "field": "slo.id",
+        },
+      },
+      "slo.instanceId": Object {
+        "terms": Object {
+          "field": "slo.instanceId",
+        },
+      },
+      "slo.revision": Object {
+        "terms": Object {
+          "field": "slo.revision",
+        },
+      },
+      "transaction.name": Object {
+        "terms": Object {
+          "field": "transaction.name",
+          "missing_bucket": true,
+        },
+      },
+      "transaction.type": Object {
+        "terms": Object {
+          "field": "transaction.type",
+          "missing_bucket": true,
+        },
+      },
+    },
+  },
+  "settings": Object {
+    "deduce_mappings": false,
+    "unattended": true,
+  },
+  "source": Object {
+    "index": ".slo-observability.sli-v3.3*",
+    "query": Object {
+      "bool": Object {
+        "filter": Array [
+          Object {
+            "range": Object {
+              "@timestamp": Object {
+                "gte": "now-7d/m",
+                "lte": "now/m",
+              },
+            },
+          },
+          Object {
+            "term": Object {
+              "slo.id": "irrelevant",
+            },
+          },
+          Object {
+            "term": Object {
+              "slo.revision": 1,
+            },
+          },
+        ],
+      },
+    },
+  },
+  "sync": Object {
+    "time": Object {
+      "delay": "65s",
+      "field": "event.ingested",
+    },
+  },
+  "transform_id": "slo-summary-irrelevant-1",
+}
+`;
diff --git a/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/occurrences.test.ts b/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/occurrences.test.ts
new file mode 100644
index 0000000000000..08dc5231d2974
--- /dev/null
+++ b/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/occurrences.test.ts
@@ -0,0 +1,52 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { createSLO } from '../../fixtures/slo';
+import {
+  monthlyCalendarAligned,
+  thirtyDaysRolling,
+  weeklyCalendarAligned,
+} from '../../fixtures/time_window';
+import { generateSummaryTransformForOccurrences } from './occurrences';
+
+describe("Summary Transform Generator for 'Occurrences' SLO", () => {
+  it('generates the correct transform for a weekly calendar aligned SLO', async () => {
+    const slo = createSLO({
+      id: 'irrelevant',
+      budgetingMethod: 'occurrences',
+      timeWindow: weeklyCalendarAligned(),
+    });
+
+    const transform = generateSummaryTransformForOccurrences(slo);
+
+    expect(transform).toMatchSnapshot();
+  });
+
+  it('generates the correct transform for a monthly calendar aligned SLO', async () => {
+    const slo = createSLO({
+      id: 'irrelevant',
+      budgetingMethod: 'occurrences',
+      timeWindow: monthlyCalendarAligned(),
+    });
+
+    const transform = generateSummaryTransformForOccurrences(slo);
+
+    expect(transform).toMatchSnapshot();
+  });
+
+  it('generates the correct transform for a 30days rolling SLO', async () => {
+    const slo = createSLO({
+      id: 'irrelevant',
+      budgetingMethod: 'occurrences',
+      timeWindow: thirtyDaysRolling(),
+    });
+
+    const transform = generateSummaryTransformForOccurrences(slo);
+
+    expect(transform).toMatchSnapshot();
+  });
+});
diff --git a/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/occurrences.ts b/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/occurrences.ts
index 1dd2c0758096c..ab5377e38b12e 100644
--- a/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/occurrences.ts
+++ b/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/occurrences.ts
@@ -6,6 +6,7 @@
  */
 
 import { TransformPutTransformRequest } from '@elastic/elasticsearch/lib/api/types';
+import { calendarAlignedTimeWindowSchema, DurationUnit } from '@kbn/slo-schema';
 import {
   getSLOSummaryPipelineId,
   getSLOSummaryTransformId,
@@ -20,6 +21,18 @@ import { buildBurnRateAgg } from './utils';
 export function generateSummaryTransformForOccurrences(
   slo: SLODefinition
 ): TransformPutTransformRequest {
+  const isCalendarAligned = calendarAlignedTimeWindowSchema.is(slo.timeWindow);
+  let isWeeklyAligned = false;
+  if (isCalendarAligned) {
+    isWeeklyAligned = slo.timeWindow.duration.unit === DurationUnit.Week;
+  }
+
+  const rangeLowerBound = isCalendarAligned
+    ? isWeeklyAligned
+      ? 'now/w'
+      : 'now/M'
+    : `now-${slo.timeWindow.duration.format()}/m`;
+
   return {
     transform_id: getSLOSummaryTransformId(slo.id, slo.revision),
     dest: {
@@ -34,7 +47,7 @@ export function generateSummaryTransformForOccurrences(
             {
               range: {
                 '@timestamp': {
-                  gte: `now-${slo.timeWindow.duration.format()}/m`,
+                  gte: rangeLowerBound,
                   lte: 'now/m',
                 },
               },
diff --git a/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/timeslices_calendar_aligned.test.ts b/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/timeslices_calendar_aligned.test.ts
new file mode 100644
index 0000000000000..32628d619d536
--- /dev/null
+++ b/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/timeslices_calendar_aligned.test.ts
@@ -0,0 +1,23 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { createSLOWithTimeslicesBudgetingMethod } from '../../fixtures/slo';
+import { monthlyCalendarAligned } from '../../fixtures/time_window';
+import { generateSummaryTransformForTimeslicesAndCalendarAligned } from './timeslices_calendar_aligned';
+
+describe("Summary Transform Generator for 'Timeslices' and 'CalendarAligned' SLO", () => {
+  it('generates the correct transform for a 7 days SLO', async () => {
+    const slo = createSLOWithTimeslicesBudgetingMethod({
+      id: 'irrelevant',
+      timeWindow: monthlyCalendarAligned(),
+    });
+
+    const transform = generateSummaryTransformForTimeslicesAndCalendarAligned(slo);
+
+    expect(transform).toMatchSnapshot();
+  });
+});
diff --git a/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/timeslices_rolling.test.ts b/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/timeslices_rolling.test.ts
new file mode 100644
index 0000000000000..867a40deeced1
--- /dev/null
+++ b/x-pack/plugins/observability_solution/slo/server/services/summary_transform_generator/generators/timeslices_rolling.test.ts
@@ -0,0 +1,23 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { createSLOWithTimeslicesBudgetingMethod } from '../../fixtures/slo';
+import { sevenDaysRolling } from '../../fixtures/time_window';
+import { generateSummaryTransformForTimeslicesAndRolling } from './timeslices_rolling';
+
+describe("Summary Transform Generator for 'Timeslices' and 'Rolling' SLO", () => {
+  it('generates the correct transform for a 7 days SLO', async () => {
+    const slo = createSLOWithTimeslicesBudgetingMethod({
+      id: 'irrelevant',
+      timeWindow: sevenDaysRolling(),
+    });
+
+    const transform = generateSummaryTransformForTimeslicesAndRolling(slo);
+
+    expect(transform).toMatchSnapshot();
+  });
+});