Fix missing appended SQL comments (#18958)

* Fix missing appended SQL comments

* ficed changelog

* linter

* changelog

sqlserver/changelog.d/18958.fixed

@@ -0,0 +1 @@
+Fix missing appended SQL comments.

sqlserver/datadog_checks/sqlserver/activity.py

@@ -14,7 +14,7 @@
 from datadog_checks.base.utils.tracking import tracked_method
 from datadog_checks.sqlserver.config import SQLServerConfig
 from datadog_checks.sqlserver.const import STATIC_INFO_ENGINE_EDITION, STATIC_INFO_VERSION
-from datadog_checks.sqlserver.utils import extract_sql_comments_and_procedure_name
+from datadog_checks.sqlserver.utils import extract_sql_comments, extract_sql_comments_and_procedure_name
 
 try:
     import datadog_agent
@@ -24,6 +24,8 @@
 DEFAULT_COLLECTION_INTERVAL = 10
 MAX_PAYLOAD_BYTES = 19e6
 
+TAIL_TEXT_SIZE = 200
+
 CONNECTIONS_QUERY = """\
 SELECT
     login_name AS user_name,
@@ -59,6 +61,10 @@
         ELSE req.statement_end_offset END
             - req.statement_start_offset) / 2) + 1) AS statement_text,
     SUBSTRING(qt.text, 1, {proc_char_limit}) as text,
+    CASE
+        WHEN LEN(qt.text) > {proc_char_limit} THEN RIGHT(qt.text, {tail_text_size})
+    ELSE ''
+    END AS tail_text,
     c.client_tcp_port as client_port,
     c.client_net_address as client_address,
     sess.host_name as host_name,
@@ -213,6 +219,7 @@ def _get_activity(self, cursor, exec_request_columns):
         query = ACTIVITY_QUERY.format(
             exec_request_columns=', '.join(['req.{}'.format(r) for r in exec_request_columns]),
             proc_char_limit=self._config.stored_procedure_characters_limit,
+            tail_text_size=TAIL_TEXT_SIZE,
         )
         self.log.debug("Running query [%s]", query)
         cursor.execute(query)
@@ -286,6 +293,10 @@ def _obfuscate_and_sanitize_row(self, row):
             )
             # sqlserver doesn't have a boolean data type so convert integer to boolean
             comments, row['is_proc'], procedure_name = extract_sql_comments_and_procedure_name(row['text'])
+            if 'tail_text' in row:
+                appended_comments, _ = extract_sql_comments(row['tail_text'])
+                if appended_comments:
+                    comments = list(set(comments + appended_comments))
             if row['is_proc'] and 'text' in row:
                 try:
                     procedure_statement = obfuscate_sql_with_metadata(