diff --git a/templates/slack-legacy-colorbar.json.tmpl b/templates/slack-legacy-colorbar.json.tmpl
new file mode 100644
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+++ b/templates/slack-legacy-colorbar.json.tmpl
@@ -0,0 +1,259 @@
+{{- /* This slack template renders colored bars on the left-hand side of messages by "hacking" the
+messages to add an attachment for each message that is to have a different colored bar. The
+attachment element has been deprectated by Slack and could be removed at any time so use this
+template at your own risk.
+
+See Slack docs:
+https://api.slack.com/messaging/webhooks
+https://api.slack.com/block-kit
+
+Documentation regarding this hack:
+https://api.slack.com/messaging/attachments-to-blocks#direct_equivalents Search for "color" on that page.
+https://api.slack.com/reference/messaging/attachments Search for "color" on this page too.
+*/ -}}
+
+{{- /*
+Slack:
+0) if explicit to do digest, do that
+1) if one custom insight, display with old style (like alarms)
+2) if only insights, display as a digest
+*/ -}}
+{{- if or .Config.IsChannelDigest .IsMultipleEvents -}}
+  {
+    "blocks": [
+      {
+        "type": "divider"
+      },
+      {
+        "type": "header",
+        "text": {
+            "type": "plain_text",
+            "emoji": true,
+            "text": "{{ $.Headline }}: {{ $.Summary }}"
+        }
+      },
+      {
+        "type": "context",
+        "elements": [
+          {
+            "type": "mrkdwn",
+            "text": "{{ $.Headline }} for *{{ $.CompanyName }}* sent on {{ $.NowDatetime }}"
+          }
+        ]
+      },
+
+      {
+        "type": "actions",
+        "elements": [
+          {
+            "type": "button",
+            "text": {
+              "type": "plain_text",
+              "text": ":gear: Manage Notifications",
+              "emoji": true
+            },
+            "url": {{$.NotificationsSettingsURL | toJSON}}
+          }
+        ]
+      }
+    ],
+    "attachments": [
+      {{ range $index, $importanceGroups := slice .EventsGroupedByImportance 0 (min (len .EventsGroupedByImportance) 4) }}
+        {{ if $index }},{{ end }}
+        {
+          "color": "{{- importanceToColor .Importance -}}",
+          "blocks": [
+            {
+              "type": "section",
+              "text": {
+                "type": "mrkdwn",
+                "text": "{{importanceToEmoji .Importance}}  *{{importanceLabel .Importance}}* ({{.Count}})"
+              }
+            },
+            {{ range $index, $group := slice $importanceGroups.Groups 0 (min (len $importanceGroups.Groups) 3)  }}
+            {{ if $index }},{{ end }}
+              {
+                "type": "section",
+                "text": {
+                  "type": "mrkdwn",
+                  "text": "*{{ $group.Name }}*"
+                }
+              },
+              {{ range $index, $event := slice .Events 0 (min (len .Events) 2)  }}
+              {{ if $index }},{{ end }}
+                {
+                  "type": "section",
+                  "text": {
+                    "type": "mrkdwn",
+                    "text": "
+                      {{- if .IsInsight -}}
+                      {{ $event.Details.GetValue "InsightPlainDescription" }}
+                      {{- else -}}
+                      {{- $event.Description -}}\n*State:* {{ .PreviousState }} → *{{ .CurrentState }}*\n*Timeframe:* {{ .StartTime }} (start) → *{{ .EndTime }}*
+                      {{- end -}}
+                    "
+                  }
+                },
+                {
+                  "type": "actions",
+                  "elements": [
+                    {{- range $index, $url := $event.Details.WithTag "url" -}}
+                    {{- join $index -}}
+                    {
+                      "type": "button",
+                      "action_id": "{{- $url.Name -}}",
+                      "text": {
+                        "type": "plain_text",
+                        "text": "{{- $url.LabelOrName -}}"
+                      },
+                      "url": "{{ $url.Value }}"
+                    }
+                    {{- end -}}
+                  ]
+                },
+                {
+                  "type": "divider"
+                }
+              {{ end }}
+            {{ end }}
+          ]
+        }
+      {{ end }}
+    ]
+  }
+{{- else if .IsSingleEvent -}}
+  {{- with .Event -}}
+  {
+    "attachments": [
+      {
+        "color": "{{- importanceToColor .Importance -}}",
+        "blocks": [
+          {
+            "type": "divider"
+          },
+          {
+            "type": "header",
+            "text": {
+              "type": "plain_text",
+              "emoji": true,
+              "text": "
+                {{- importanceToEmoji .Importance }} {{ importanceLabel .Importance -}}\n{{- $.Summary -}}
+                {{- range $index, $label := (.Details.WithTag "label").Values -}}
+                  {{ " " }}[{{- $label.Name -}}]
+                {{- end -}}
+              "
+            }
+          },
+          {
+            "type": "context",
+            "elements": [
+              {
+                "type": "mrkdwn",
+                "text": "{{ $.Headline }} for *{{ $.CompanyName }}* sent on {{ $.NowDatetime }}"
+              }
+            ]
+          },
+          {
+            "type": "section",
+            "text": {
+              "type": "mrkdwn",
+              "text": "
+                {{- if not .IsInsight -}}
+                  *State:* {{ .PreviousState }} → *{{ .CurrentState }}*\n*Timeframe:* {{ .StartTime }} (start) → *{{ .EndTime }}*\n
+                {{- end -}}
+                {{- range $index, $detail := .Details.General -}}
+                  *{{ $detail.LabelOrName }}*: {{ $detail.Value }}\n
+                {{- end -}}
+                {{- with $dimensions := (.Details.WithTag "dimension").FormatDimensions -}}
+                  {{- if gt (len $dimensions) 0 -}}
+                    *Dimensions*:\n
+                    {{- range $index, $detail := $dimensions -}}
+                      {{- if (and (eq "i_device_id" $detail.Name) ($.Event.Details.Has "DeviceName")) -}}
+                        - *Device*: {{ $.Event.Details.GetValue "DeviceName" -}}
+                          {{- if $.Event.Details.Has "DeviceType" }} ({{ $.Event.Details.GetValue "DeviceType" }}) {{ end -}}
+                          {{- range $index, $label := ($.Event.Details.WithTag "device_label").Values -}}
+                            [{{- $label.Name -}}]
+                          {{- end -}}
+                          {{- "\\n" -}}
+                      {{- else -}}
+                        - *{{ $detail.LabelOrName }}*: {{ $detail.Value }}\n
+                      {{- end -}}
+                    {{- end -}}
+                  {{- end -}}
+                {{- end -}}
+                {{- with $metrics := (.Details.WithTag "metric").FormatMetrics -}}
+                  {{- if gt (len $metrics) 0 -}}
+                    *Metrics*:\n
+                    {{- range $index, $metric := $metrics -}}
+                      - {{ $metric.Value }} {{ $metric.LabelOrName }}\n
+                    {{- end -}}
+                  {{- end -}}
+                {{- end -}}
+                {{- with $stats := .Details.WithTag "statistic" -}}
+                  {{- if gt (len $stats) 0 -}}
+                    *Summary*:\n
+                    {{- range $index, $detail := $stats -}}
+                      - *{{ $detail.LabelOrName }}*: {{ $detail.Value }}\n
+                    {{- end -}}
+                  {{- end -}}
+                {{- end -}}
+                {{- with $issues := (.Details.WithTag "issue").Values -}}
+                  {{- if gt (len $issues) 0 -}}
+                    *Issues*:\n
+                    {{- range $index, $issue := $issues -}}
+                      - {{ range $index, $label := $issue.Labels -}}
+                          [{{- $label.Name -}}]{{ " " }}
+                        {{- end -}}
+                        *{{ $issue.Description }}*
+                        {{- if $issue.DetailedInfo }}: {{ end -}}
+                        {{- range $index, $detailedItem := $issue.DetailedInfo -}}
+                          {{- joinWith $index ", " -}}
+                          {{- $detailedItem -}}
+                        {{- end -}}
+
+                        {{- if $issue.Url -}}
+                        {{- " " }}- <{{ $issue.Url }}|{{ if $issue.UrlLabel }}{{ $issue.UrlLabel }}{{ else }}More details{{ end }} »>
+                        {{- end -}}
+                        \n
+                    {{- end -}}
+                  {{- end -}}
+                {{- end -}}
+              "
+            }
+          },
+          {
+            "type": "actions",
+            "elements": [
+              {{- range $index, $url := .Details.WithTag "url" -}}
+              {{- join $index -}}
+              {
+                "type": "button",
+                "action_id": "{{- $url.Name -}}",
+                "text": {
+                  "type": "plain_text",
+                  "text": "{{- $url.LabelOrName -}}"
+                },
+                "url": "{{ $url.Value }}"
+              }
+              {{- end -}}
+            ]
+          }
+        ]
+      }
+    ]
+
+
+
+
+
+
+
+
+  }
+  {{- end -}}
+{{- end -}}
+
+{{- /*
+Note: In this v1 channel, only one event is expected to be sent at a time,
+so there is no case for multiple events.
+*/ -}}