Added support for a retry interval to monitors

If a check fails and retries are used you can now specify a specific value for that. So you can check faster if the site goes back up again.

src/languages/en.js

@@ -1,8 +1,11 @@
 export default {
     languageName: "English",
     checkEverySecond: "Check every {0} seconds.",
+    retryCheckEverySecond: "Retry every {0} seconds.",
     "Avg.": "Avg. ",
     retriesDescription: "Maximum retries before the service is marked as down and a notification is sent",
+    retryIntervalInactive: "Inactive",
+    retryIntervalDescription: "If retries are and used this value is greater then zero this interval will be used instead.",
     ignoreTLSError: "Ignore TLS/SSL error for HTTPS websites",
     upsideDownModeDescription: "Flip the status upside down. If the service is reachable, it is DOWN.",
     maxRedirectDescription: "Maximum number of redirects to follow. Set to 0 to disable redirects.",
@@ -64,6 +67,7 @@ export default {
     Port: "Port",
     "Heartbeat Interval": "Heartbeat Interval",
     Retries: "Retries",
+    "Heartbeat Retry Interval": "Heartbeat Retry Interval",
     Advanced: "Advanced",
     "Upside Down Mode": "Upside Down Mode",
     "Max. Redirects": "Max. Redirects",

src/pages/EditMonitor.vue

@@ -106,6 +106,18 @@
                                 </div>
                             </div>
 
+                            <div class="my-3">
+                                <label for="retry-interval" class="form-label">
+                                    {{ $t("Heartbeat Retry Interval") }} 
+                                    <span v-if="monitor.retryInterval > 0">({{ $t("retryCheckEverySecond", [ monitor.retryInterval ]) }})</span>
+                                    <span v-else>({{ $t("retryIntervalInactive") }})</span>
+                                </label>
+                                <input id="retry-interval" v-model="monitor.retryInterval" type="number" class="form-control" required min="0" step="1">
+                                <div class="form-text">
+                                    {{ $t("retryIntervalDescription") }}
+                                </div>
+                            </div>
+
                             <h2 class="mt-5 mb-2">{{ $t("Advanced") }}</h2>
 
                             <div v-if="monitor.type === 'http' || monitor.type === 'keyword' " class="my-3 form-check">
@@ -289,6 +301,7 @@ export default {
                     name: "",
                     url: "https://",
                     interval: 60,
+                    retryInterval: 0,
                     maxretries: 0,
                     notificationIDList: {},
                     ignoreTls: false,