diff --git a/include/enotify.php b/include/enotify.php
index 58e1a75f00..db44b464de 100644
--- a/include/enotify.php
+++ b/include/enotify.php
@@ -33,8 +33,8 @@ function notification($params)
 	$a = \get_app();
 
 	// Temporary logging for finding the origin
-	if (!isset($params['language']) || !isset($params['uid'])) {
-		Logger::log('Missing parameters.' . System::callstack());
+	if (!isset($params['uid'])) {
+		Logger::notice('Missing parameters "uid".', ['params' => $params, 'callstack' => System::callstack()]);
 	}
 
 	// Ensure that the important fields are set at any time
@@ -42,7 +42,7 @@ function notification($params)
 	$user = DBA::selectFirst('user', $fields, ['uid' => $params['uid']]);
 
 	if (!DBA::isResult($user)) {
-		Logger::log('Unknown user ' . $params['uid']);
+		Logger::error('Unknown user', ['uid' =>  $params['uid']]);
 		return false;
 	}
 
diff --git a/mod/item.php b/mod/item.php
index 40c01da20f..100205f1c4 100644
--- a/mod/item.php
+++ b/mod/item.php
@@ -131,7 +131,7 @@ function item_post(App $a) {
 	}
 
 	if ($parent) {
-		Logger::log('mod_item: item_post parent=' . $parent);
+		Logger::info('mod_item: item_post parent=' . $toplevel_item_id);
 	}
 
 	$post_id     = intval(defaults($_REQUEST, 'post_id', 0));
diff --git a/src/Database/DBA.php b/src/Database/DBA.php
index 897ab2e6ed..326fb0771d 100644
--- a/src/Database/DBA.php
+++ b/src/Database/DBA.php
@@ -425,7 +425,7 @@ class DBA
 
 		if ((substr_count($sql, '?') != count($args)) && (count($args) > 0)) {
 			// Question: Should we continue or stop the query here?
-			Logger::log('Parameter mismatch. Query "'.$sql.'" - Parameters '.print_r($args, true), Logger::DEBUG);
+			Logger::error('Parameter mismatch. Query "'.$sql.'" - Parameters '.print_r($args, true));
 		}
 
 		$sql = self::cleanQuery($sql);
diff --git a/src/Model/Item.php b/src/Model/Item.php
index 475f9131fd..e4d18c9a74 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -1336,7 +1336,7 @@ class Item extends BaseObject
 			$expire_date = time() - ($expire_interval * 86400);
 			$created_date = strtotime($item['created']);
 			if ($created_date < $expire_date) {
-				Logger::log('item-store: item created ('.date('c', $created_date).') before expiration time ('.date('c', $expire_date).'). ignored. ' . print_r($item,true), Logger::DEBUG);
+				Logger::notice('item-store: item created ('.date('c', $created_date).') before expiration time ('.date('c', $expire_date).'). ignored. ' . print_r($item,true));
 				return 0;
 			}
 		}
@@ -1354,7 +1354,7 @@ class Item extends BaseObject
 			if (DBA::isResult($existing)) {
 				// We only log the entries with a different user id than 0. Otherwise we would have too many false positives
 				if ($uid != 0) {
-					Logger::log("Item with uri ".$item['uri']." already existed for user ".$uid." with id ".$existing["id"]." target network ".$existing["network"]." - new network: ".$item['network']);
+					Logger::notice("Item with uri ".$item['uri']." already existed for user ".$uid." with id ".$existing["id"]." target network ".$existing["network"]." - new network: ".$item['network']);
 				}
 
 				return $existing["id"];
@@ -1405,7 +1405,7 @@ class Item extends BaseObject
 
 		// When there is no content then we don't post it
 		if ($item['body'].$item['title'] == '') {
-			Logger::log('No body, no title.');
+			Logger::notice('No body, no title.');
 			return 0;
 		}
 
@@ -1432,7 +1432,7 @@ class Item extends BaseObject
 		$item['author-id'] = defaults($item, 'author-id', Contact::getIdForURL($item["author-link"], 0, false, $default));
 
 		if (Contact::isBlocked($item["author-id"])) {
-			Logger::log('Contact '.$item["author-id"].' is blocked, item '.$item["uri"].' will not be stored');
+			Logger::notice('Contact '.$item["author-id"].' is blocked, item '.$item["uri"].' will not be stored');
 			return 0;
 		}
 
@@ -1442,22 +1442,21 @@ class Item extends BaseObject
 		$item['owner-id'] = defaults($item, 'owner-id', Contact::getIdForURL($item["owner-link"], 0, false, $default));
 
 		if (Contact::isBlocked($item["owner-id"])) {
-			Logger::log('Contact '.$item["owner-id"].' is blocked, item '.$item["uri"].' will not be stored');
+			Logger::notice('Contact '.$item["owner-id"].' is blocked, item '.$item["uri"].' will not be stored');
 			return 0;
 		}
 
 		if ($item['network'] == Protocol::PHANTOM) {
-			Logger::log('Missing network. Called by: '.System::callstack(), Logger::DEBUG);
+			Logger::notice('Missing network. Called by: '.System::callstack(), Logger::DEBUG);
 
 			$item['network'] = Protocol::DFRN;
-			Logger::log("Set network to " . $item["network"] . " for " . $item["uri"], Logger::DEBUG);
+			Logger::notice("Set network to " . $item["network"] . " for " . $item["uri"], Logger::DEBUG);
 		}
 
 		// Checking if there is already an item with the same guid
-		Logger::log('Checking for an item for user '.$item['uid'].' on network '.$item['network'].' with the guid '.$item['guid'], Logger::DEBUG);
 		$condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
 		if (self::exists($condition)) {
-			Logger::log('found item with guid '.$item['guid'].' for user '.$item['uid'].' on network '.$item['network'], Logger::DEBUG);
+			Logger::notice('Found already existing item with guid '.$item['guid'].' for user '.$item['uid'].' on network '.$item['network']);
 			return 0;
 		}
 
diff --git a/src/Protocol/ActivityPub/Processor.php b/src/Protocol/ActivityPub/Processor.php
index f4befcd6f1..5899d7f25f 100644
--- a/src/Protocol/ActivityPub/Processor.php
+++ b/src/Protocol/ActivityPub/Processor.php
@@ -289,7 +289,7 @@ class Processor
 			$item['owner-link'] = $activity['actor'];
 			$item['owner-id'] = Contact::getIdForURL($activity['actor'], 0, true);
 		} else {
-			Logger::log('Ignoring actor because of thread completion.', Logger::DEBUG);
+			Logger::info('Ignoring actor because of thread completion.');
 			$item['owner-link'] = $item['author-link'];
 			$item['owner-id'] = $item['author-id'];
 		}
@@ -358,7 +358,11 @@ class Processor
 			}
 
 			$item_id = Item::insert($item);
-			Logger::log('Storing for user ' . $item['uid'] . ': ' . $item_id);
+			if ($item_id) {
+				Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
+			} else {
+				Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
+			}
 
 			if ($item['uid'] == 0) {
 				$stored = $item_id;
diff --git a/src/Protocol/ActivityPub/Receiver.php b/src/Protocol/ActivityPub/Receiver.php
index e0ee1f0f90..5ee81302f2 100644
--- a/src/Protocol/ActivityPub/Receiver.php
+++ b/src/Protocol/ActivityPub/Receiver.php
@@ -62,16 +62,16 @@ class Receiver
 	{
 		$http_signer = HTTPSignature::getSigner($body, $header);
 		if (empty($http_signer)) {
-			Logger::log('Invalid HTTP signature, message will be discarded.', Logger::DEBUG);
+			Logger::warning('Invalid HTTP signature, message will be discarded.');
 			return;
 		} else {
-			Logger::log('HTTP signature is signed by ' . $http_signer, Logger::DEBUG);
+			Logger::info('Valid HTTP signature', ['signer' => $http_signer]);
 		}
 
 		$activity = json_decode($body, true);
 
 		if (empty($activity)) {
-			Logger::log('Invalid body.', Logger::DEBUG);
+			Logger::warning('Invalid body.');
 			return;
 		}
 
@@ -79,7 +79,7 @@ class Receiver
 
 		$actor = JsonLD::fetchElement($ldactivity, 'as:actor');
 
-		Logger::log('Message for user ' . $uid . ' is from actor ' . $actor, Logger::DEBUG);
+		Logger::info('Message for user ' . $uid . ' is from actor ' . $actor);
 
 		if (LDSignature::isSigned($activity)) {
 			$ld_signer = LDSignature::getSigner($activity);
diff --git a/src/Protocol/DFRN.php b/src/Protocol/DFRN.php
index e6524de965..39d982bb92 100644
--- a/src/Protocol/DFRN.php
+++ b/src/Protocol/DFRN.php
@@ -1546,7 +1546,7 @@ class DFRN
 			$author["network"] = $contact_old["network"];
 		} else {
 			if (!$onlyfetch) {
-				Logger::log("Contact ".$author["link"]." wasn't found for user ".$importer["importer_uid"]." XML: ".$xml, Logger::DEBUG);
+				Logger::debug("Contact ".$author["link"]." wasn't found for user ".$importer["importer_uid"]." XML: ".$xml);
 			}
 
 			$author["contact-unknown"] = true;
diff --git a/src/Protocol/Diaspora.php b/src/Protocol/Diaspora.php
index 77ad017044..3687fb9d4b 100644
--- a/src/Protocol/Diaspora.php
+++ b/src/Protocol/Diaspora.php
@@ -942,7 +942,7 @@ class Diaspora
 
 		$person = DBA::selectFirst('fcontact', [], ['network' => Protocol::DIASPORA, 'addr' => $handle]);
 		if (DBA::isResult($person)) {
-			Logger::log("In cache " . print_r($person, true), Logger::DEBUG);
+			Logger::debug("In cache " . print_r($person, true));
 
 			// update record occasionally so it doesn't get stale
 			$d = strtotime($person["updated"]." +00:00");
diff --git a/src/Util/XML.php b/src/Util/XML.php
index ba146ec7b8..4dd6d84ecb 100644
--- a/src/Util/XML.php
+++ b/src/Util/XML.php
@@ -6,6 +6,7 @@ namespace Friendica\Util;
 
 use Friendica\Core\Logger;
 use DOMXPath;
+use Friendica\Core\System;
 use SimpleXMLElement;
 
 /**
@@ -422,10 +423,11 @@ class XML
 
 		$x = @simplexml_load_string($s);
 		if (!$x) {
-			Logger::log('libxml: parse: error: ' . $s, Logger::DATA);
+			Logger::error('Error(s) while parsing XML string.', ['callstack' => System::callstack()]);
 			foreach (libxml_get_errors() as $err) {
-				Logger::log('libxml: parse: ' . $err->code." at ".$err->line.":".$err->column." : ".$err->message, Logger::DATA);
+				Logger::info('libxml error', ['code' => $err->code, 'position' => $err->line . ":" . $err->column, 'message' => $err->message]);
 			}
+			Logger::debug('Erroring XML string', ['xml' => $s]);
 			libxml_clear_errors();
 		}
 		return $x;